Question

1. The sum of the series in A. P. is 40^1/2, the common difference is 2^1/2 and the last term is 13. Find the first term
and the number of terms in the series.​

Answer 1

Answer:

The sum of n terms of AP is the sum(addition) of first n terms of the arithmetic sequence. It is equal to n divided by 2 times the sum of twice the first term – 'a' and the product of the difference between second and first term-'d' also known as common difference, and (n-1), where n is numbers of terms to be added.