Question

Which formula represents the nth term of arithmetic sequence 2, 5, 8, 11, ...?

Formula: An = A1 + (n - 1)d

Answer 1

B

Explanation:

`a1 = 2 \\ a2 = 5 \\ d = a2 - a1 = 5 - 2 = 3`

`an = 2 + (n - 1)3 \\ an = 2 + 3n - 3 \\ an = 3n - 1`