Hi people, as you can see i am new in this forum.(adsbygoogle = window.adsbygoogle || []).push({});

Sorry if i am posting in wrong section.

Im going to try to traduce the problem.

" f(n) is the sum o n terms of a arithmetic progression. "

Show that :

f(n+3) -3f(n+2) + 3f(n+1)-f(n) = 0

I just want to know if

-3f(n+2) = f(-3n -6) ??

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# Basic question.

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