Question

In a school , the total number of students in 10 A division is equal to the total number of students in 10 B. One student is to be selected from each division.Number of boys in 10 A is 20.The probability of selecting a boy from 10 A is 2/5 and that from 10 B is 3/5. a) How many students are there in 10 A? b) What is the probability of selecting a girl from 10 A? c) How many boys are there in 10 B? d) What is the probability of both the selected students being boys ?

Answer 1

a) 50

b) 30/50

c) 30

d) 20*30/50*50