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

4

Step-by-step 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