MathDB
Basic Sequence

Source:

January 19, 2006

Problem Statement

1 \minus{} 2 \plus{} 3 \minus{} 4 \plus{} \cdots \minus{} 98 \plus{} 99 \equal{} (A)\minus{}\! 50 \qquad (B)\minus{}\! 49 \qquad (C)\ 0 \qquad (D)\ 49 \qquad (E)\ 50
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