There are 2 gates to enter a school and 3 staircases from first floor to the second floor. How many possible ways are there for a student to go from outside the school to a classroom on the second floor and come back ?

Answer:- From outdoor to class room on second floor:

Scholar can go into school at 2 ways. He can go to second floor from first floor in 3 ways.

Since, he has to do both,

No. of ways of going to class=2×3=6

In the similar 6 ways he can come back. Since, he has to go in and come back, total no. of ways=6×6=36.