Prove that the su, of 3 consecutive integers is always a multiple of 3 prove that the sum of a two digit and it's reversal is multiple of 11

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section2.6: Inequalities
Problem 80E
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  1. Prove that the su, of 3 consecutive integers is always a multiple of 3
  2. prove that the sum of a two digit and it's reversal is multiple of 11
  3. Prove that the difference between the squre root of any odd integer and the integer itself is always an even integer.
  4. Frove that the negative of any even integer is even
  5. Prove that the difference between an even integer and an odd integer is even.
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