Question

4. Mr and Mrs X stay in a house along with their seven children. The female to male ratio in the family is 1:2
Find the probability that all the children are either boy or girl.​

Answer 1

Answer:

total no. of people are 9

so let the no. of females be x and no. males be

9-x

as the ratio is 1:2

so 9/(9-x)=1:2

so 2x = 9-x

so 3x=9. x= 3

so no. of female kids =2 as one female is mrs x

so no. of male kids = 5 as one male is mr x

so the probability that all the children are either boy or girl is zero