Question

A box contains two pairs of socks of two colours (black and white). I have picked out a white sock first and latter if I pick one more with my eyes closed, what is the probability that it will make a pair?

A
12
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B
14
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C
13
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D
15
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Solution

The correct option is C 13Total number of socks in the box is = 4. On picking out one white sock, number of socks remaining in the box is =3 (2 black socks and 1 white sock) Probability=number of favourable outcomesnumber of possible outcomes ∴ P (picking another sock to make it a pair) =13 So, option (c) is the correct answer.

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