I've been thinking on this problem for 2 days but I haven't found even a clue. The question is to prove the correctness of the following identity:
Could you give me a hint about how to prove this?
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Using mathematical induction I guess would be the easier way.
Originally Posted by p0oint Using mathematical induction I guess would be the easier way. Yes I know, but I think it's hard to use induction because it has power. BTW, it has two variables. I don't know how to use induction when there are two variables.
EDIT: I think it can be solved with double counting. But I don't what I should count in two different ways.
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