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2003 AMC 10B Problems/Problem 1

From AoPSWiki

1. Which of the following is the same as

$\frac{2-4+6-8+10-12+14}{3-6+9-12+15-18+21}$ ?

$\textbf{(A)}\ -1 \qquad\textbf{(B)}\ -\frac23 \qquad\textbf{(C)}\ \frac23 \qquad\textbf{(D)}\ 1 \qquad\textbf{(E)}\ \frac{14}...$

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