Question

the sum The first six terms of a geometric series is 15,624 and the common ratio is 5 what is the first term of the series

Answer 1

4

Explanation:

The sum of the first n terms of a geometric series is:

S = a₁ (1 − r^n) / (1 − r)

Given n = 6, S = 15624, and r = 5:

15624 = a₁ (1 − 5^6) / (1 − 5)

a₁ = 4