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Q.

A man has 3 pairs of black socks and 2 pairs of brown socks kept together in a box. If he dressed hurriedly in the dark, the probability that after he has put on a black sock, he will then put on another black sock is

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a

1/3

b

2/3

c

3/5

d

2/15

answer is A.

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Detailed Solution

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PB1= 6C110C1=610=35 PB2/B1=59B2= black ∴ PB1∩B2=PB1PB2/B1=35×59=13

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