a bag contains 10 black and 16 white balls.22 balls are drawn one by one till 4 white balls remain in the bag.what is the probability the 22th ball drawn is black. all balls are distinct.

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- Dec 8th 2010, 07:54 AMayushdadhwalprobabilty
a bag contains 10 black and 16 white balls.22 balls are drawn one by one till 4 white balls remain in the bag.what is the probability the 22th ball drawn is black. all balls are distinct.

- Dec 9th 2010, 05:31 AMCaptainBlack
- Dec 9th 2010, 11:19 AMSoroban
Hello, ayushdadhwal!

Quote:

. Is this relevant?

I have a back-door approach to this problem.

I may be totally wrong, but I can't shake my reasoning.

. . . . . . . . .

. . . . . . . . . . . . . . . . . . . .

What is the probability that**this**is black?

Isn't it . ?

- Jan 2nd 2011, 06:38 AMayushdadhwal
will someone explain soroban sir's answer

- Jan 2nd 2011, 06:57 AMCaptainBlack