Question

Write the explicit formula for the sequence.
2, 4, 6, 8, 10, ...

Answer 1

a(n) = 2 + 2(n - 1)

Explanation:

Since each new term is derived from the previous term by adding 2, this is an arithmetic sequence, and the "common difference" is 2.

Then a(n) = 2 + 2(n - 1)