Question

find the common ratio of the geometric sequence.
1, 4, 16, 64, ...

a) 4
b)2
c)6
d) 8

Answer 1

$a_1=;\ a_2=4;\ a_3=16;\ a_4=64\\\\r=a_2:a_1\\\\\boxed{4:1=4}\to\fbox{a)}$