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Q.

n=12n2+n+1n!=

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a

2e – 1

b

2e + 1

c

6e – 1

d

6e + 1

answer is C.

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Detailed Solution

  n=1 2n2+n+1n =n=1 2nn-1+1n-1+1n =n=1 (n-1)+1n-1+e+(e-1) =2n=1 1n-2+1n-1+2e-1 =2e+e+2e-1 =6e-1

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