GRE Question of the Day (October 31)

Math

In a sequence a1, a2,…, each term after the first is found by taking the negative of the preceding term, and adding 1. If a1 = 2, what is the sum of the first 99 terms?

(A) 49
(B) 50
(C) 51
(D) 99
(E) 101

Question Discussion & Explanation

Correct Answer - C - (click and drag your mouse to see the answer)