Question

if the sum of first five terms of an ap is equal to the sum of first ten terms of the ap then show that the sum of first fifteen terms is zero​

Answer 1

Step-by-step explanation:

By using the formula :

Sum of n terms = n/2 [2a + (n-1)d]

Where a=first term

And d = difference between 2 consecutive terms.

Hope it helps you.