Official Guide Explanation:
Problem Solving #40

Background

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Solution and Metadata

Question: 40
Page: 158
Difficulty: 4 (Moderately Easy)
Category 1: Arithmetic > Properties of Integers > Evens and Odds

Explanation: This is something you should know in order to handle more difficult number properties problems. The best way to represent an even integer is as 2i, where i is an integer. Thus, if n is an integer, the choice that represents an even is 2n, choice (C). (A), (B), and (E) will be even or odd depending on whether n is even or odd, while (D) will always be odd--it is one greater than an even (2n).

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