Question

The nth term of the G.P. with a=2 and r=3 is 54. then n=​

Answer 1

Step-by-step explanation:

We know an=ar^n-1

Given a=2,r=3, an=54

54=2.3^n-1

27=3^n-1

3^3=3^n-1

Base equal so comparing power of both sides

3=n-1

n=3+1=4