Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?\nOptions:\n(A) 10\n(B) 12\n(C) 7\n(D) 8\n(E) 9
Let’s work this out in a step by step way to be sure we have the right answer.
(A)
This is a simple alternating addition and subtraction series.

In the first pattern, 3 is added; in the second, 2 is subtracted.

.

Thus, the answer is (A)