1.

There are two friends Ram and Sandeep. Ram has x different physics books and Sandeep has 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 but not the same set.

Answer»

There are two friends Ram and Sandeep. Ram has x different physics books and Sandeep has 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 but not the same set.




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