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, 2008

Number theory Difficulty 1.0 Junior Find the answer Canada

If $a = 7$ and $b = 13$ , the number of even positive integers less than $ab$ is

(A) $\dfrac{ab-1}{2}$ (B) $\dfrac{ab}{2}$ (C) $ab-1$ (D) $\dfrac{a+b}{4}$ (E) $(a-1)(b-1)$

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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.