A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen is denoted by the random variable X. Show that
a)P(X=0)=120/2730
b)P(X=2)=1296/2730
a)P(X=0)=120/2730
b)P(X=2)=1296/2730