Question

in an A.p the first term is -5 and last term is 45. if sum on n' term in the A.p is 120 then complete the activity to find n.​

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.