Probability
Aptitude

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Q.

Abhishek has 9 pairs of dark blue socks and 9 pairs of black socks. He keeps them all in the same bag. If he picks out three socks at random, then what is the probability that he will get a matching pair?

 A.

$1$

 B.

$\dfrac{2\times ^9C_2\times ^9C_1}{{18}^C_3}$

 C.

$\dfrac{ ^9C_3\times ^9C_1}{{18}^C_3}$

 D.

None of these

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Solution:
Option(A) is correct

If he draws any combination of 3 socks he will definitely have the matching pair of either colour.


(1) Comment(s)


Prashanth Reddy
 ()

Won't there any question of only left and right forming a pair of socks?