1.

Passengers are to travel by a double decked bus which can accommodate 13 in the upper deck and 7 in the lower deck. The number of ways that they can be divided if 5 refuse to sit in the upper deck and 8 refuse to sit in the lower deck, is

Answer» `20=13U+7L`
Number of ways`=.^7C_5=,^7C_2`
`=(7*6)/(2*1)=21`.


Discussion

No Comment Found

Related InterviewSolutions