Question

out of 35 students participateingin a debate 10 are girls find the probility that the winner is a boy

Answer 1

simple!
total no of students=35
no. of girls=10
no.of boys=35-10
=25
probability of the winner is boy=25/35
=5/7

Answer 2

sample space= 35
no. of girls=10
therefore no. of boys = 35-10=25
so probability of boy winner= 25/35
                                            =0.7142857143