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Let underset(r=1)overset(n)sumr^(4)=f(n)...

Let `underset(r=1)overset(n)sumr^(4)=f(n)," then "underset(r=1)overset(n)sum(2r-1)^(4)` is equal to

A

`f(2n)-16 f(n)`

B

`f(2n)-7f(n)`

C

`f(2n-1)-8f(n)`

D

none of these

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A
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