Question

find the sum of first nth terms of the list of numbers whose magnitude nth term is given by
An = 3+2n

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Answer 1

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Answer 2

Put n =1
An = 5

Put n=2
An = 7

Put n=3
An = 9

Series - 5,7,9,11......

It is an AP with d = 2

Sum of n terms = n/2 [2a+(n-1)d]
n/2 [10+(n-1)2]
n/2 [8+2n]
.
.
.
Which is the required answer!