Question

What is the probability that student chosen at random out of 3 girls and 4 boys is a boy

Answer 1

Because The boys number are more than The Girls i.e. 4 to 3

Answer 2

S ={G,G,G,B,B,B,B}
n(S)=7


A ={H,H,H,H}
n(A)=4

$Probability of A = \frac{n(a)}{n(s)} \\ \\ = \frac{4}{7}$
HOPE IT HELPS....