A n - n 2 - 2 n - a 7

We have #160; a _ n = n ^ 2 / 2 ^ n For a_7 , n=7 ∴ #160; a _ 7 = 7 ^ 2 / 2 ^ 7 = 49 / 128 ...

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Property 2

a n = n 2 / 2...

Question

$a_{n} = \frac{n^{2}}{2^{n}}; a_{7}$

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Solution

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