Question

Double Decker bus can have 80 passengers 35 in upper and 40 in lower deck. how many ways can a group of 80 passengers...

Answer 1

Total seats = 80
In the Upper deck = 35
and in the Lower deck = 45

Number of ways of seating the particular 10 passengers in the lower deck = 45P10.
Number of ways of seating 5 particular passengers in the upper deck = 35P5.
In the remaining 65 seats 65 passengers are seated in 65P65 =65! Ways.

These three arrangements are independent of each other.

Answer = 45P10* 35P5* 65!