A person wants to go from station P to station R via station Q.There are 4 routes from P to Q and 5 routes from Q to R.In how many ways can he travel from P to R -

Options

A. 9
B. 1
C. 20
D. 12

Answer

C

Explanation

He can go from` " " `P to Q in 4 ways
and` "
" `Q to R in 5 ways
So number of ways of travel from P to R is 4 x 5 = 20
Ans.[3]