Question

Which of the sequences is an arithmetic sequence?

Answer 1

Answer: Choice A

This is because we're adding -6 to each term, i.e. subtracting 6 from each term, to get the next term

• -2+(-6) = -8
• -8+(-6) = -14
• -14+(-6) = -20
• -20+(-6) = -26

and so on. The gap between adjacent terms is the same width. We say that the common difference is d = -6.