1.

\( \lim _{n \rightarrow \infty}\left(\frac{1}{n^{3}+1}+\frac{4}{n^{3}+1}+\frac{9}{n^{3}+1}+\ldots .+\frac{n^{2}}{n^{3}+1}\right) \) is equal to(A) 1(B) \( 2 / 3 \)(C) \( 1 / 3 \)(D) 0

Answer»
1/1+n^3 +4/n^3+1
put n equal to 1/0  then 1/1+{1/0}^3
0/1
then answer is D

n(n+1)(2n+1)/6(n3+1)

(2n+ n)/(6n2-6n+6)

(2+1/n)/(6-6/n+6/n2)

n=infinity 

==2/6=1/3



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