### Method NO. 2 : Upseting Method, again

22Dec07

Lets calculate more compilated sum

further, the last one equals to and now the first of the sums is equal to however the second one is easy, cause its a geometric sequence equal to under the law from previous post. Now we have , in the result of elementary algebraic transformation we recieve

It’s easy to notice that we could put everything in the place of 2, so let there be x. Then

And now we have quite general law🙂

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