Question 49
An alternating sum. If $S_{n}=1-2+3-4+5-6+\ldots+(-1)^{n+1} n$, where $n$ is a positive integer, then $S_{1992}+S_{1993}$ is:
(a) -2
(b) -1
(c) 0
(d) 1
(e) 2
(a) -2
(b) -1
(c) 0
(d) 1
(e) 2
MathNet 2007-part-01 — 187 problems (EN–VI) Question 49
Math Olympiad Vault · MathNet 2007-part-01 — 187 problems (EN–VI)