There are 13 boys and 10 girls in a class. If three students are selected at random, in how many ways that 1 girl & 2 boys are selected ?	Choose the correct option.
A) 120 B) 480 C) 780 D) 720 E) 800

Rationale: n ( s ) = sample space = 23 c 3 = 1771 e = event that 1 girl and 2 boys are selected n ( e ) = we have to select 2 boys from 13 and 1 girl from 10 = 13 c 2 * 10 c 1 = 780 ans - c
Answer: C