Login/Sign Up
Home » The sum of the first 7 terms of an AP is 49 and the sum of its first 17 term is 289. Find the sum of its first n terms.
The sum of the first 7 terms of an AP is 49 and the sum of its first 17 term is 289. Find the sum of its first n terms.
Arithmetic Progression | CBSE | Class 10 | Maths | RS Aggarwal
The sum of the first 7 terms of an AP is 49 and the sum of its first 17 term is 289. Find the sum of its first n terms.

Solution:

Suppose that a is the first term and d is the common difference of an AP, then we have:

i

More Material