Question

What is a formula for the nth term of the given sequence? 15,75,375​

Answer 1

3 × 5 ^ n

Explanation:

since the series is exponential, the ratio between adjacent terms is 5.

nth term of geometric/exponential series is given by:

nth term = first term × (ratio)^(n-1)

= 15 × 5^ (n-1)

= 15 × 5^n × 5^-1

= 3× 5^n