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Ram has x different physics books and Sandeep have y different mathematics books. Find the number of ways in which Ram and Sandeep can exchange their books in such a way that after exchanging they still have same number of books and same set.

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Ram has x different physics books and Sandeep have y different mathematics books. Find the number of ways in which Ram and Sandeep can exchange their books in such a way that after exchanging they still have same number of books and same set.




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