Question 168
Evaluate the sum
$$
1+2+3-4-5+6+7+8-9-10+\ldots-2010
$$
where each three consecutive signs $+$ are followed by two signs $-$.
$$
1+2+3-4-5+6+7+8-9-10+\ldots-2010
$$
where each three consecutive signs $+$ are followed by two signs $-$.
MathNet 2010 — Part 05 Question 168
Math Olympiad Vault · MathNet 2010 — Part 05