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Algebra Difficulty 2.0 Junior Find the answer Canada

The sum of the arithmetic series $(-300)+(-297)+(-294)+\ldots+306+309$ is

(A) $309$ (B) $927$ (C) $615$ (D) $918$ (E) $18$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.