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Hi everyone.

I hardly remember the fomulas of summation of sequence.

I got this problem.

[tex]{\frac{1}{8}}\sum^{\infty}_{n=2}n({\frac{3}{4}})^{n-2}[/tex]

The result is 2.5.

How can I solve this problem?

Thanks all. :)

I hardly remember the fomulas of summation of sequence.

I got this problem.

[tex]{\frac{1}{8}}\sum^{\infty}_{n=2}n({\frac{3}{4}})^{n-2}[/tex]

The result is 2.5.

How can I solve this problem?

Thanks all. :)

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