[练习册] OG13-PS:221-230

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If a, b, and c are consecutive positive integers and a < b < c, which of the following must be true?

I c-a = 2

II abc is an even integer.

III is an integer.
  • I only
  • II only
  • I and II only
  • II and III only
  • I,IIandIII
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