Rational odds

Algebra Level 3

Is there an assignment of the rational numbers to even and odd such that:

  1. The sum of two odd numbers is even

  2. The sum of two even numbers is even

  3. The sum of an even and odd number is odd

  4. Integers maintain their usual assignment as even or odd (for instance, 3 must be odd and -4 must be even).

No Yes

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1 solution

Terence Coelho
Sep 29, 2017

Consider the assignment of 1/2. Since 1/2+1/2=1 and 1 must be odd, there is no possible assignment of 1/2.

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