In an arithmetic progression the sum of the first n term,denoted by # S_n# is given by #S_n=n^2+8n# Find the first term and the common difference ?
1 Answer
Apr 20, 2018
The sum of the first n term of an AP,denoted by
So
n th term of the series will be
Inserting
Hence first term
and common difference
Check
Sum of first n terms