Prove by induction that is divisible by 11 ..
Last edited by bobak; Feb 26th 2008 at 07:27 AM.
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are you sure? for n = 1,
Sorry the latex was a bit confusing, I cleaned it up.
Ok, let's assume it holds for n, we'll now show it does so for n+1 is divisible by 11 then So: Since (divisible by 11) and is divisible by 11 It follows that is also divisible by 11
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