Use induction to prove that for every integer , .

Here's the solution:

http://img32.imageshack.us/img32/5042/14616641.gif

I don't understand where the term came from in the middle line. Could anyone explain?

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- Oct 24th 2009, 09:26 PMRoamSimple Proof by Induction
Use induction to prove that for every integer , .

Here's the solution:

http://img32.imageshack.us/img32/5042/14616641.gif

I don't understand where the term came from in the middle line. Could anyone explain? - Oct 24th 2009, 10:35 PMDefunkt