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Passengers are to travel by a double dec...

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

Text Solution

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