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Topic Started: Jan 30 2013, 10:20 PM (722,651 Views)
Yuwree
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Official Pine Tree
I just realised that I never learnt fractions, probability or ratios.
Im well on track to becoming the worst scientist ever
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Ihla
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I need insoles
Brity...wat?


:rofl:
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
Awww my male best friend is offline, I was gonna send him that problem.
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orangedaffodils
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Let ε <0
Brity u bish =_=
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
orangedaffodils
Jul 25 2013, 05:15 AM
Brity u bish =_=
Was my reasoning sound? I need to knooow. :'(
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paper.star
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s l e e p y
@orange omg too complicated. i just thought that if every single seat was taken, the probability of an empty seat being mine is 1/100

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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
paper.star
Jul 25 2013, 05:18 AM
@orange omg too complicated. i just thought that if every single seat was taken, the probability of an empty seat being mine is 1/100

That's only if there's a mad dash for seats and everyone sits at the same time *randomly, IF I AM CORRECT. Since every seating is a separate event, the probability of it being yours or not would be 50/50 every time, since there are only two options for good ol' Centus, and they're equally likely.
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orangedaffodils
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Artichoke
Jul 25 2013, 05:11 AM
idk why mathematically, but... Given this information without any extra variables, there are 3 possibilities from the start. If we talk about Asshole and Centus, with Asshole being the first guy and Centus being the 100th.

1) Asshole ends up sitting in his own seat.
2) Asshole sits in Centus's seat.
3) Asshole sits in another person but Centus's seat.

The third is irrelevant. He either sits in Centus's seat, or he doesn't, so removing everything else but this, it's a 50/50 chance that he will or he won't. If he sits in someone else's seat, it just repeats 1 and 2, so the next guy, Duous, has the same chances - either he sits in Centus's seat, or he sits in another, so it's 50/50 again. By the time it gets to Centus, it's just two possibilities; either Centus sits in his seat, or he doesn't.

idk if that makes sense. idk any maths. I didn't think this would be right, I assumed I'd need a complex formula. :x
No, it's right - just a little rough around the edges; no complex formula needed! :P

it's a pretty easy induction argument to show that the probabilities of each passenger having to choose a seat other than their own increase straightforwardly from 1/100 to 1/99 to 1/98, etc. Intuitively, at any point, all the seats that are taken except possibly one have either been claimed by the passenger assigned to that seat or been passed over by the passenger assigned to that seat, because it was randomly claimed by someone else, as you've stated.

So there's really only one randomly chosen seat.

this is one of my favorite problems of all time, now y'all know that. :gaypimp:
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
That explanation seems more logical. I AM ENJOYING MY LIFE RIGHT NOW.

If y'all have any more problems... :gaypimp:
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paper.star
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s l e e p y
Artichoke
Jul 25 2013, 05:19 AM
paper.star
Jul 25 2013, 05:18 AM
@orange omg too complicated. i just thought that if every single seat was taken, the probability of an empty seat being mine is 1/100

That's only if there's a mad dash for seats and everyone sits at the same time, IF I AM CORRECT. Since every seating is a separate event, the probability of it being yours or not would be 50/50 every time, since there are only two options for good ol' Centus, and they're equally likely.
ohhhh, makes sense :lol:
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
^ I added a pretty important word to that in my edited post. It's important that every choice is a random choice and that all choices are happening at the same time, otherwise I think it'd still be 50/50, but idk. :x

This reminds me that I need to bash Professor Layton again.
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babycakes
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Yuwree
Jul 25 2013, 05:13 AM
I just realised that I never learnt fractions, probability or ratios.
Im well on track to becoming the worst scientist ever
wow have i been out of high school that long that they've stopped teaching this stuff?? :blink:

@Arti: have you tried solving the einstein quiz? someone threw away the tissue on which i'd worked it out =_= it's not mathematical though
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orangedaffodils
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Artichoke
Jul 25 2013, 05:25 AM
^ I added a pretty important word to that in my edited post. It's important that every choice is a random choice and that all choices are happening at the same time, otherwise I think it'd still be 50/50, but idk. :x
It has to be random. and no, all the choices are not happening simultaneously, they're happening consecutively since the passengers board one at a time. ie; the passenger on board takes their seat before the next steps on, and so on and so forth.

I can ask another question is y'all want, i'm just taking old practice math olympiad problems that I happened to find in a folder that I thought to be empty :lol:
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Brity Spear
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-haAHAHHAHAHAAH sorry
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
orangedaffodils
Jul 25 2013, 05:29 AM
It has to be random. and no, all the choices are not happening simultaneously, they're happening consecutively since the passengers board one at a time. ie; the passenger on board takes their seat before the next steps on, and so on and so forth.

I can ask another question is y'all want, i'm just taking old practice math olympiad problems that I happened to find in a folder that I thought to be empty :lol:
Yeah, I didn't think that through. Guess I got cocky. :angel:

And, yes! Sure. I would enjoy that, as long as they're more logic than maths, like this one was. I'm not as good with maths as I used to be, since I've not done it for 2 years.

babycakes
Jul 25 2013, 05:29 AM
@Arti: have you tried solving the einstein quiz? someone threw away the tissue on which i'd worked it out =_= it's not mathematical though
Nope. What is it?
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babycakes
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Artichoke
Jul 25 2013, 05:37 AM
Nope. What is it?
it's a brain teaser of sorts, it's not very difficult but i had fun. just go0gle
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Yeshh another problem pls. Felt good when I finally understood your inductive reasoning solution to the airplane problem :D
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orangedaffodils
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Let ε <0
K, found another probability type problem:

You paint the surface of a solid wooden cube blue. why, blue? I don't fucking know. You cut the cube into 27 smaller cubes in the natural fashion. You throw all the small cubes into a bag, pick one at random, put in on the table, and see that the 5 visible faces of the smaller cube are unpainted.

What is the probability that the hidden face of the small cube is blue?

Again, if you attempt to g00gle the answer, I'LL KNOW =_=
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I want another tinychat session. :sadangel:
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Yuwree
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Official Pine Tree
orangedaffodils
Jul 25 2013, 05:44 AM
K, found another probability type problem:

You paint the surface of a solid wooden cube blue. why, blue? I don't fucking know. You cut the cube into 27 smaller cubes in the natural fashion. You throw all the small cubes into a bag, pick one at random, put in on the table, and see that the 5 visible faces of the smaller cube are unpainted.

What is the probability that the hidden face of the small cube is blue?

Again, if you attempt to g00gle the answer, I'LL KNOW =_=
20%?

Im not even trying :c
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babycakes
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.2222 ?
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answer?
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orangedaffodils
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babycakes
Jul 25 2013, 05:50 AM
.2222 ?
nah, that's approx. the probability that you'll choose a cube with exactly one face painted if you take one cube from the bag at random.

Keep trying! ^_^
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Jul 25 2013, 05:50 AM
answer?
wait when you say paint the surface do you mean the entire surface or just one face of the cube
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orangedaffodils
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Jul 25 2013, 05:51 AM
Anon
Jul 25 2013, 05:50 AM
answer?
wait when you say paint the surface do you mean the entire surface or just one face of the cube
I mean you paint all 6 faces blue.
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Windmill
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Gertrude
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Jul 25 2013, 05:44 AM
I want another tinychat session. :sadangel:
Then go make one and strip for us anon. :shifty: This might scare the anon away though... :rofl:
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orangedaffodils
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Let ε <0
Yuwree
Jul 25 2013, 05:46 AM
orangedaffodils
Jul 25 2013, 05:44 AM
K, found another probability type problem:

You paint the surface of a solid wooden cube blue. why, blue? I don't fucking know. You cut the cube into 27 smaller cubes in the natural fashion. You throw all the small cubes into a bag, pick one at random, put in on the table, and see that the 5 visible faces of the smaller cube are unpainted.

What is the probability that the hidden face of the small cube is blue?

Again, if you attempt to g00gle the answer, I'LL KNOW =_=
20%?

Im not even trying :c
:alright:
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Jul 25 2013, 05:50 AM
answer?
sa
Spoiler: click to toggle
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
babycakes
Jul 25 2013, 05:42 AM
it's a brain teaser of sorts, it's not very difficult but i had fun. just go0gle
Just looked it up, and that's easy, tho. The answer is "you can't". You can see from the question it mentions 4 pets, but the fish isn't mentioned anywhere in the facts, so the 5th person with the unstated pet might not have a fish, but in fact have a snake, or something like that. There is no assurance that the 5th pet is a fish, so you can't determine who has it through facts alone.

orangedaffodils
Jul 25 2013, 05:44 AM
K, found another probability type problem:

You paint the surface of a solid wooden cube blue. why, blue? I don't fucking know. You cut the cube into 27 smaller cubes in the natural fashion. You throw all the small cubes into a bag, pick one at random, put in on the table, and see that the 5 visible faces of the smaller cube are unpainted.

What is the probability that the hidden face of the small cube is blue?

Again, if you attempt to g00gle the answer, I'LL KNOW =_=
Now I don't want to answer in case I mess it up and ruin my ~rep~... :sadangel:

...1/7?
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Artichoke
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nam fuit ante Helenam cunnus taeterrima belli causa
Aw fuck, idk, that's a faux pas. :dramaqueen:

im not even going to correct that

I'M NOT GOING TO CLICK "EDIT" UNTIL I HAVE THIS SORTED OUT IN MY HEAD. Allow me to consult my Rubik's cube for cube reference because I can't spatial recognition.

nvm
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babycakes
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orangedaffodils
Jul 25 2013, 05:51 AM
babycakes
Jul 25 2013, 05:50 AM
.2222 ?
nah, that's approx. the probability that you'll choose a cube with exactly one face painted if you take one cube from the bag at random.

Keep trying! ^_^
oic i did it backwards? i haven't done math in so long though idek .. i'm going to guess .1111 then

@Arti: you're right and that's the more correct answer (logically) although it's simpler (for the purposes of the brain teaser) to assume the person who doesn't not have a pet fish does have a fish as a pet rather than any other random animal ^_^
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orangedaffodils
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Let ε <0
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Jul 25 2013, 05:54 AM
Anon
Jul 25 2013, 05:50 AM
answer?
sa
Spoiler: click to toggle
Crap, I forgot to give the hint:

it's not 6/7
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Dyslexia
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Posted Image
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HolyYoong
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My shupanova
My cat is touchy today..
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Die Zicke
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Caffeine is good for you.
... since when did we stop talking about desserts?!
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