There are two children and . has 12 different toys and has 13 different toys. Find the number of ways in which and can exchange their toys in such a way that after exchanging they still have same number of toys but not the same set.
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Let us take the toys from both of them.
Now we select toys and give them to and the remaining to which can be done in
This also contain the ways in which they have their original set of toys.
Hence,the answer is
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