Question

Find a general formula for the nth term of the geometric series with: a4 = 16 and r = 2.

an = 4 · 2^n − 1
an = 8 · 2^n − 1
an = 16 · 2^n − 1
an = 2 · 2^n − 1

Answer 1

My answer is B am I right?

Answer 2

n th term in GP = a * r^(n-1)

Answer 3

ar^3=16 put value of r and find a

Answer 4

option D

Answer 5

thanks