Question

What is the probability of a family has two children. If one of them is boy, then that of other is also boy?

Answer 1

Probability that both children are boy$=\frac{1}{4}$

Cars$=\{BB,GG,GB,BG\}$

No. of favourable cars$=1$

Total no. of cars$=4$

Thus, probability$=\frac{1}{4}$