Which of the following is not an arithmetic sequence?
4,7,10,13,16
15,9,3,-3,-9
1,2,3,4,5
2,4,8,16,32

2,4,8,16,32

Step-by-step explanation:

In an arithmetic sequence, consecutive terms differ by a constant value which is called the common difference.

Looking at the given sequences,

1) 4,7,10,13,16

7 - 4 = 10 - 7 = 13 - 10 = 3

The common difference is 3. Therefore, it is an arithmetic sequence.

2) 15,9,3,-3,-9

9 - 15 = 3 - 9 = - 3 - 3 = - 6

The common difference is - 6. Therefore, it is an arithmetic sequence.

3) 1,2,3,4,5

2 - 1 = 3 - 2 = 4 - 3 = 5 - 4 = 1

The common difference is 1. Therefore, it is an arithmetic sequence.

4) 2,4,8,16,32

4 - 2 is not equal to 8 - 4

Therefore, it is not an arithmetic sequence.

Last one

Step-by-step explanation:

2,4,8,16,32

Difference is not common

4-2 = 2

8-4 = 4

This is a geometric sequence

16

step-by-step explanation:

16 is the absolute value

step-by-step explanation: