To find the sum of the first 24 terms of an AP whose nth term is given by an=3+2n, what is the best approach to solve this question?
We know that we have two formulae for finding Sum to n terms of an AP.
where Sn is the sum of n terms of the AP,
'n' is the number of terms of the AP,
'a' is the first term of the AP
'd' is the common difference.
Also, Sn=n(first term+last term)2
Therefore, a1=5, a2=7, a3=9.......a24=51
First term = 5, 24th term = 51, d= 2