from a total of 5 boys and 6 girls , how many 4 - person committees can be selected if the committee must have exactly 2 boys and 2 girls ?
answer = e = 150 no of 4 person committees that can be formed = 5 c 2 * 6 c 2 = 150 answer e
multiply(multiply(const_3, 5), multiply(5, 2))