Question

Which of the following is an arithmetic sequence?

2, 4, 8, 16, ...
-8, -6, -4, -2, ...
-2, 4, -6, 8, ...

Answer 1

first of all you need to know what is an arithmetic sequence ?

Answer 2

old question but will respond so this can be closed

for an arithmetic sequence, each subsequent term is determined by adding/subtracting the same constant (d)

so for each answer choice, simply subtract (term) - (term before it) and see which one gives you a constant value for all terms