There are 13 boys and 10 girls in a class. If three students are selected at random, in how many ways that 1 girl or 2 boys are selected ? Answers.
A) 88 B) 90 C) 92 D) 96 E) 98
n(s) = sample space = 23C3 = 1771   E = event that 1 girl and 2 boys are selected   n(E) = we have to select 2 boys from 13 or 1 girl from 10   = 13C2 + 10C1   = 88   88ns - 88
<result>A</result>
There are 13 boys and 10 girls in a class. If three students are selected at random, in how many ways that 1 girl or 2 boys are selected ?