Question

Choose the correct or most suitable answer from the given four alternatives:

Four persons are selected at random from a group of 3 men, 2 women and 4 children. The probability that exactly two of them are children is 

(a) 3/4

(b) 10/23

(c) 1/2

(d) 10/21

Answer 1

(d) 10/21

Total no of person = 3 + 2 + 4 = 9

Selecting 4 from 9 can be done in 9C₄ ways