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Question
A double decker bus can accommodate (u + ) passengers, u in the upper deck and in the lower deck. The number of ways in which the (u + ) passengers can be distributed in the two decks, if r () particular passengers refuse to go in the upper deck and S(u) refuse to sit in the lower deck, is 
 ^{u–S}C_{–r}

 ^{u–S}P_{–r}

The correct answer is:
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