take n even 2k instead of n

can you solve it ??

try n odd sub 2k+1 instead of n

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- Nov 28th 2011, 12:17 PM #1

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- Nov 28th 2011, 01:45 PM #2

- Nov 29th 2011, 10:23 AM #3

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- Nov 29th 2011, 10:29 AM #4