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Algebra Difficulty 1.0 Junior Find the answer Canada

If $P$ is a negative integer, which of the following is always positive?

(A) $P^2$ (B) $\frac{1}{P}$ (C) $2P$ (D) $P-1$ (E) $P^3$

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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.