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If $a$ and $b$ are integers and $a-b$ is even, which of the following must always be even?

  1. $ab$
  2. $a^{2}+b^{2}+1$
  3. $a^{2}+b+1$
  4. $ab-b$
in General Aptitude by (21.2k points) 4 29 75
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