Question

Which one of the following is not a geometric progression?

• A. $1,2,4,8,16,32$
• B. $4,-4,4,-4,4$
• C. $12,24,36,48$
• D. $6,12,24,48$

Answer 1

Answer: (C)

$12,24,36,48$

For geometric progression, the ratio of the consecutive terms should be equal.

Here $12,24,36,48$ is not a geometric progression. Here only the difference is common i.e. $12$.

Rest all options have same common ratio i.e., in option A, the ratio is $2$. In option B, the ratio is $-1$.

And in option D, the ratio is $2$.
Here the given sequence is an arithmetic progression.