In a class there are 20 boys and 21 girls. In how many ways can a boy and a girl be selected?	Answers: A) 508 B) 420 C) 800 D) 570 E) 503
We can select one boy from 20 boys in 20 ways.   We select one girl from 21 girls in 21 ways   We select a boy and girl in 20 * 21 ways i.e., = 420 ways.   Answer:420
<result>B</result>
In a class there are 20 boys and 21 girls. In how many ways can a boy and a girl be selected?