Parity

Revision as of 22:55, 3 January 2016 by Sw993 (talk | contribs)

Parity refers to whether a number is even or odd.

While this may seem highly basic, checking the parity of numbers is often an useful tactic for solving problems, especially with proof by contradictions and casework. r nb8 99999999999999999998== Problems ==

Introductory

  • Find $\gcd(a+b,a^2+b^2)$ if $\gcd(a,b) = 1$.

Intermediate

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