Question

What are the values of a 1 and r of the geometric series? 1 + 3 + 9 + 27 + 81

Answer 1

a1 = 1

r = 3

Explanation:

a1 = first term = 1

r = common ratio = 2nd term/1st term

= 3/1

r = 3

Answer 2

a₁ = 1; r = 3

Explanation:

a₁ represents the first term. It is 1 in this case.

r represents the common ratio between terms. In this case it's 3 / 1 = 3.