In a class there are 27 boys and 15 girls.  The teacher wants to select a boys and a girl for the monitor ship of the class.  In how many ways can the teacher make this selection?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

The teacher has to perform two jobs

 

First, he has to select a boy among 27 boys.

Second, he has to select a girl among 15 girls.

 

The first job can be performed in 27 ways and the second in 15 ways.  Therefore, by the fundamental principle of multiplication, the required no. of ways of selection is 27 x 15 = 405.

Answered by  | 4th Jun, 2014, 03:23: PM