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Complex Plane

138.If an=n(n...

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138.If an=n(n!),then sigma(r=1 to 100 ar)

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Sigma(r=1 to n) of [r/{(r^4)+(r^2)+1}] is equal to

Q. If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is

(a) n(n − 2)

(b) n(n + 2)

(c) n(n + 1)

(d) n(n − 1)

1 + \frac{1 + 2}{2} + \frac{1 + 2 + 3}{3} + . . . .

to n terms is S, then S is equal to

(a)

\frac{n (n + 3)}{4}

\frac{n (n + 2)}{4}

\frac{n (n + 1) (n + 2)}{6}

a_{n} = n (n!), t h e n \sum_{r = 1}^{100} a_{r}

If 1+ $\frac{1 + 2}{2} + \frac{1 + 2 + 3}{3} + . . . .$ to n terms is S. Then, S is equal to

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