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A bag contains some white and some black balls, all combinations being equally likely. The total number of balls in the bag is 12. Four balls are drawn at random from the bag at random without replacement

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Probability that all the four balls are Black is equal to

If the bag contains 10 black and 2 white balls then The probability that all four balls are black is equal to

If all the four balls are black, then the probability That the bag contains 10 black balls ism equal to

Probability that two balls are black and two are White is

answer is , , A, A.

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Detailed Solution

Out of balls, the no. of black balls can be 0 or 1 or 2 or..….or 12(13 equally likely cases)

required probability

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