Question

What is the fifth term of the geometric sequence?
5, 15, 45,...
A. 3645
B. 1875
C. 1215
D. 405

Answer 1

ar^n-1 (r=15/5=3,n=5(given))
5*3^5-1
5*3^4
5*81
=405


fifth term of the geometric sequence:
5, 15, 45,...is
D.405