Question

Find the sum of the first 30 terms of the sequence below.
an=3n+2

Answer 1

When n=1, an = 3*1 + 2 = 5

when n=2, an = 3*2 + 2 = 8

when n = 3, an = 3*3 + 2 = 11

Answer 2

So the arithmatic sequence is 5,8,11,14.........


Sum to n terms of an arithmatic sequence is given by: