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## Homework Statement

(ab)[itex]^{n}[/itex]= a[itex]^{n}[/itex]b[itex]^{n}[/itex] for any 3 consecutive numbers n [itex]\in[/itex]N

## Homework Equations

for an abelian group G, ab=ba [itex]\forall[/itex]a,b[itex]\in[/itex]G

if a[itex]\in[/itex]G, a has an inverse element also [itex]\in[/itex]G such that aa[itex]^{-1}[/itex] = e

## The Attempt at a Solution

doesnt look right but heres the attempt

http://pics.livejournal.com/jackdnutter/pic/000013d1 [Broken]

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