Question

Which of the following is NOT an arithmetic sequence?

a
1, 2, 3, 4,...
b
0.25, 0.5, 0.75, 1, ...
c
2, 2.5, 3, 3.5,...
d
-2, 4, -6, 8,...

Answer 1

D

Explanation:

To be an arithmetic sequence, the numbers have to be added or subtracted by a constant number. D is not the answer because -2+6 equals 4, but 4+6 doesn't equal -6, so D cannot be a arithmetic sequence.