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Algebra Difficulty 1.0 Junior Find the answer Canada

If $a = 2$ and $b = 5$ , which of the following expressions has the greatest value?

(A) $\dfrac{a}{b}$ (B) $\dfrac{b}{a}$ (C) $a - b$ (D) $b - a$ (E) $\dfrac{1}{2}a$

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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.