Ram is visiting a friend. Ram knows that his friend has 2 children and 1 of them is a boy. Assuming that a child is equally likely to be a boy or a girl, then the probality that the other child is a girl is

Options

A. `1//2`
B. `1//3`
C. `2//3`
D. `7//10`

Answer

C

Explanation

Total sample space `={B_(1)B_(2),B_(1)G_(1),G_(1)B_(2)}`
Favourable outcomes `={B_(1)G_(1),G_(1)B_(2)}`
`therefore` Required probability `=(2)/(3)`