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Aptitude | Probability | Question 3

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A box contains 6 black, 5 brown and 2 yellow balls. If 2 balls are selected at random, what is the probability that both are black?
(A) 4/23
(B) 5/26
(C) 7/26
(D) 8/15

Answer: (B)


There are total 13 balls in the sample space
Probability of choosing any two of them is 13C2.
There are total 6 black balls and probability of choosing any two of them is 6C2
Therefore the required answer is 6C2/13C2 = 5/26.

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Last Updated : 16 Sep, 2021
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