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If underset(r=1)overset(n)Sigma r(r+1)(2...

If `underset(r=1)overset(n)Sigma r(r+1)(2r +3)=an^4+bn^3+cn^2+dn +e ` then

A

a=1/2

B

b=8/3

C

c=9/2

D

e=0

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A, B, C, D
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