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by Wilbur
November 29th, 2007, 4:01 pm
Forum: Brainteaser Forum
Topic: Card Game !
Replies: 12
Views: 76306

Card Game !

It is that simple.What if you didn't go through the cards in order. Assume you look at only the 27th card. What is prob it is an Ace? (it's match).It's 1/13. What is the prob that the 42 card is a match:1/131/13 x 52 = 4
by Wilbur
October 11th, 2007, 5:44 pm
Forum: Brainteaser Forum
Topic: Dots on the unit circle
Replies: 13
Views: 69680

Dots on the unit circle

<t>Point 1 will be anywhere.Point 2 can be anywhere between directly across (180 from point 1) or directly on top of point 1 with equal prob.If point 2 is directly across, point 3 will be in a semicircle with prob. 1If point 2 is directly on top, point 3 will be in a semicircle with prob. 0.5(1 + 0....
by Wilbur
October 3rd, 2007, 7:07 pm
Forum: Brainteaser Forum
Topic: What's the value ...
Replies: 31
Views: 69565

What's the value ...

it doesn't exist....as you said it's it flip flops from -infinity to +infinity....is this called chaotic?
by Wilbur
September 27th, 2007, 2:28 pm
Forum: Brainteaser Forum
Topic: x raised to itself infinite times
Replies: 21
Views: 78819

x raised to itself infinite times

so.....is a^b^c = a^(b^C) or (a^b)^cbecause 3^9 does not equal 9^3To get the answer root 2, we are assuming is a^b^c = a^(b^C)
by Wilbur
August 14th, 2007, 5:46 pm
Forum: Off Topic
Topic: Population explosion : the curse of humanity
Replies: 43
Views: 70420

Population explosion : the curse of humanity

QuoteOriginally posted by: samudra ..... reltively low per capita population(for US)......What exactly is per capita population?
by Wilbur
June 27th, 2007, 2:35 pm
Forum: Brainteaser Forum
Topic: Stick Traingle Problem!
Replies: 4
Views: 72090

Stick Traingle Problem!

Thanks Blondie.That makes it clear.No I can stop thinking about it.....
by Wilbur
June 27th, 2007, 1:48 pm
Forum: Brainteaser Forum
Topic: Stick Traingle Problem!
Replies: 4
Views: 72090

Stick Traingle Problem!

<t>Blondie,Please explain:"We now have to 'multiply' that probability with the one of getting one segment l.At first break, the probability of finding a segment of length l is by breaking 1 at l, or at 1-l, by symmetry"I don't disagree with your answer...I just don't follow where the factor of 2 com...
by Wilbur
June 22nd, 2007, 4:08 pm
Forum: Brainteaser Forum
Topic: an interview coin quesiton
Replies: 23
Views: 79056

an interview coin quesiton

<t>Our intent is to flip until we see 8 heads in a row and then stop. We can then look back and see if 8 tails in a row had been flipped before we stopped. (I assume that seeing greater than 8 tails is a row would be considered 8 tails in a row).So we start flipping and we get 8 heads before we flip...
by Wilbur
June 6th, 2007, 5:53 pm
Forum: Brainteaser Forum
Topic: Four quarters under a table cloth
Replies: 15
Views: 74162

Four quarters under a table cloth

So...could someone state CLEARLY what the question is.
by Wilbur
April 20th, 2007, 1:55 pm
Forum: Brainteaser Forum
Topic: another physics brainteaser
Replies: 50
Views: 85402

another physics brainteaser

Is it moving horizontally, or is it moving along an inclined plane?If the direction is a straight line, after a long time the speed will be either zero, infinity, or remain at the initial V.
by Wilbur
April 10th, 2007, 4:04 pm
Forum: Brainteaser Forum
Topic: another balls problem
Replies: 3
Views: 75948

another balls problem

<t>Or some other clear reasoning.....1) put your hand in box 1 and grab r balls. Keep you hand in the box. Now drop all but one ball. Pull out your hand....this is the same as question 1...you're still just pulling one ball out of Box 1.2)put your hand in box 1 and grab r balls. Keep you hand in the...
by Wilbur
April 10th, 2007, 12:06 pm
Forum: Brainteaser Forum
Topic: another balls problem
Replies: 3
Views: 75948

another balls problem

assuming that you don't ever look at the balls until the "final" pull, the probablility never changes.The answer to both questions is n/(m+n)
by Wilbur
March 30th, 2007, 7:28 pm
Forum: Off Topic
Topic: Starting war with Iran.
Replies: 79
Views: 82339

Starting war with Iran.

Quotewhy does it have to be one or the other ? we've got enough nukes to do both PPauper.....we?....I thought you were Canadian?
by Wilbur
March 8th, 2007, 12:43 pm
Forum: Brainteaser Forum
Topic: Interview Question
Replies: 5
Views: 80141

Interview Question

<t>Guy number one makes a guesstimate of what the average salary is. Announces it out loud.Guy number 2 computes the difference between the guessed average and his own salary. He then whispers a number that is in the range of the computed number to guy 3. Guy 3 makes the same computation, and then a...
by Wilbur
February 27th, 2007, 3:48 pm
Forum: Brainteaser Forum
Topic: X orders
Replies: 0
Views: 78400

X orders

double post