My textbook has an example on multiplication of power series.(adsbygoogle = window.adsbygoogle || []).push({});

" Multiply the geometric series [tex] x^n[/tex] by itself to get a power series for [tex]1/(1-x)^2 [/tex] for |x|<1 "

from this we get the [tex]c_{n}[/tex]=n+1

O.K. I get that the coefficients are 1 for all n but why +1.

Could someone please explain this to me if possible.

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# Textbook question on power series

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