If the sum of first four terms of an AP is 40 and that first 14 terms is 280 .Find the sum of its first n terms 

 

Asked by pirnceprince75 | 24th Nov, 2019, 07:53: PM

Expert Answer:

Let the first term be 'a' and common difference be 'd'

Answered by Renu Varma | 25th Nov, 2019, 10:14: AM