Question

What’s the fifth term of a sequence whose first term is 5 and whose common ratio is 3?

Answer 1

405.

Explanation:

This is a geometric sequence where the nth term = a1 r^(n -1).

Here a1 = 5 and r = 3 so

the fifth term a5 = 5(3)^(5-1)

= 5 * 81

= 405.