In a family of 3 children, the probability of having at least one boy is

There are three children in the family:
The total number of outcomes =23=8
The number of favourable cases:
Atleast one of them is boy means all those cases in which we have either 1, 2, or 3 boys.
The eight combinations are BBB, BBG, BGB, BGG, GBB, GBG, GGB, GGG
The probability of having atleast one boy in a family =7/8