# Find the sum of the series:to n terms

In the given question we need to find the sum of the series.

For that, firs, we need to find the nth term of the series so that we can use summation of the series with standard identities and get the required sum.

The series given is to n terms

The series can be written as,

.

So, nth term of the series,

The denominator of ‘an’ forms an AP with first term a = 1, last term = 2n-1 and common difference, d= 2.

Now, Sum of the AP,

Now, we need to find the sum of this series, Sn.

Note:

I. Sum of first n natural numbers, 1 + 2 +3+…n,

II. Sum of squares of first n natural numbers, 12 + 22 + 32+….n2,

III. Sum of cubes of first n natural numbers, 13 + 23 + 33 +…..n3,

IV. Sum of a constant k, N times,

So, for the given series, we need to find,

From, the above identities,

So, Sum of the series,

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