Question

What is the 30th term of the arithmetic series 2, 5, 8, ...?

a. 89
b. 88
c. 87
d. 86

Answer 1

Here, a = 2, d=5-2 = 3, n = 30

we know, an = a+(n-1)d

an = 2+(30-1)3

an = 2+87

an = 89

OPTION A IS YOUR ANSWER....

Answer 2

An = A1 + d (n -1)

A30 = A1 + d (30 -1)

d = 5-2 = 3

A30 = 2 + 3 (29) = 89

Answer: option a. 89