Integers and Types of Numbers - Pre-Algebra

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Question

If a and b are even integers, what must be odd?

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Answer

The sum (or difference) or 2 even integers is even. Similarly, the product (or quotient) of 2 even integers is also even; therefore the answer must be a+b-1, which can be easily checked by plugging in any two even numbers.

For example, if a=2 and b=4, a+b-1=2+4-1=5, which is odd.

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