Question

Which of the following is not geometric sequence

A. 2 10 50 250 1250
B. 1 1 2 3 5 8 13 21
C. 1 4 9 16 25 36
D. -4 -2 -1 -0.5 -0.25 -0..125

Answer 1

A. The common ratio is 5

B. The sequence is the Fibonacci sequence. There is no common ratio.

C. The sequence is a sequence of squares. There is no common ratio.

D. The common ratio is 1/2.

_____

A and D are geometric sequences.

B and C are not geometric sequences.