A double decker bus can accommodate 75 passengers 35 in the lower deck and 45 in the upper deck the number of ways in which the passengers can be accommodated if 5 want to sit only in the lower deck and 8 want to sit only in the upper deck
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https://www.meritnation.com/ask-answer/question/there-are-10-seats-in-a-dubble-dacker-bus-6-in-the-lower-d/permutations-and-combinations/6938675
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