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Q.

Ltnn13+23+33+.+n3212+22+32+.+n23=

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a

16/27

b

27/16

c

8/27

d

27/8

answer is B.

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Detailed Solution

Ltnn13+23+33+.+n3212+22+32+.+n23 =Ltnn(n2(n+1)24)2(n(n+1)(2n+1)6)3

(1/4)2(1/3)3=(1/16)(1/27)=2716

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