Question
Mathematics Question on Arithmetic Progression
Let Sn be the sum of the first n terms of the series a1+a2+...an+… If Sn=n2+4n, then the nth term an is
A
2n+3
B
2n-1
C
2n+5
D
2n-3
E
2n
Answer
2n+3
Explanation
Solution
The correct option is (A) : 2n+3