Question

How-do-i-find-the-sum-of-a-sequence-whose-common-difference-is-in-a-p?

Answer 1

Answer :

Let us consider that the 1st term of the AP is a and the common difference is d.

Now, to find the sum of the AP upto n-terms, we need to apply the following formula,

Sn = n/2 {2a + (n - 1)d}

We can so find the sum if we know the 1st term and the nth term of the AP.

Let, the first term is t1 and the nth term is tn.

Now, to find the sum of the AP upto n-terms be

Sn = n/2 (t1 + tn)

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