Question

If 1+3+5+........+n terms = 256 , find n

Answer 1

Use sum of n terms of a A. P. FORMULA

Answer 2

Remember this formula for the rest of your life and you ll be able to solve these types of questions in less than 10 sec.

sum of consecutive odd numbers is n². where n is the number of terms the sequence goes to.

So the answer to you question will be n²=256

Taking square root on both sides

n=16 answer.

n²=256