Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 2009-07-16 04:15:41

soroban
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Registered: 2007-03-09
Posts: 452

]

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## #2 2009-07-16 05:21:20

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

### Re: Find the flaw

soroban wrote:

Last edited by JaneFairfax (2009-07-16 06:28:10)

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## #3 2009-07-16 05:45:37

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

### Re: Find the flaw

JaneFairfax wrote:

True, but that's not the main problem.
After your fix, we still have that P(B) = 2/3, so the "conclusion" still holds.

Why did the vector cross the road?
It wanted to be normal.

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## #4 2009-07-16 06:36:46

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

### Re: Find the flaw

I dont see what the problem is, really (if not the minor one I pointed out). If you have two Black balls and one White ball in the bag, the probability of picking a Black ball is ⅔. If you have one Black ball and two other balls that can be either colour, the probability of picking a Black ball is also ⅔. There is nothing wrong with the probabilities of two different scenarios happening to be the same.

Last edited by JaneFairfax (2009-07-17 02:34:53)

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