Question

Find the thirteenth term of an arithmetic sequence if the first term is 3 and the common difference is 3

Answer 1

39

Explanation:

Formula for the nth term (an) = a1 + d(n - 1) where a1 = the first term and d = common difference.

So here the 13th term = 3 + 3(13 - 1)

= 3 + 3*12

= 39 (answer).