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Question

nLt[1+4+9++n2]n3=

A
2
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B
3
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C
1/3
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D
1
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Solution

The correct option is C 1/3

nLtn(n+1)(2n+1)6n3
1+22+32+.......n2=n(n+1)(1n+1)6
nLtn(n+1)(1n+1)6n3
=nLt[16(1+1n)(2+1n)]
=26=13


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