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If underset(k=1)overset(n)sum(underset(m...

If `underset(k=1)overset(n)sum(underset(m=1)overset(k)summ^(2))=an^(4)+bn^(3)+cn^(2)+dn+e`, then

A

`a = 1/12`

B

`b = 1/3`

C

`c = 1/6`

D

`d = 1/6`

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