Math
posted by math help2 .
a class has 10 boys and 5 girls; three students are selected from the class at random one after other. the probability that the first two boys and the third is a girl??

Pr=(10/15)(9/14)(5/13)

10/15 * 9/14 * 5/13 = 15/91 = 0.165 (3sf)