Question

Find the 70th term of the following arithmetic sequence.
2, 11, 20, 29

Answer 1

623.

Explanation:

nth term = a1 + d(n - 1) where a1 = first term, d = common difference.

Here a1 = 2 and d = 9, so

70th term = 2 + 9(70-1)

= 623.

Answer 2

The 70th term is -799