Question

What is the geometric sequence of 2 4

Answer 1

an = ar^ (n- 1)

for n = 3 (3rd term)

r = common ratio = 4/ 2 = 2

a3 = 2 (2) ^ (3-1)

a3 = 2 (2)^2

a3 = 2 (4)

a3 = 8

n= 4 (4th term)

a4 = 2 (2)^(4-1)

a4 = 2 (2)^3

a4 = 2 (8)

a4 = 16

2, 4 , 8 , 16