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A double-decker bus carry (u+l) passeng...

A double-decker bus carry `(u+l)` passengers, `u` in the upper deck and `l` in the lower deck. Find the number of ways in which the `u+l` passengers can be distributed in the two decks, if `r(lt=l)` particular passengers refuse to go in the upper deck and `s(lt=u)` refuse to sit in the lower deck.

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