GMAT Problem Solving
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Source: OG11th
Level: 3
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.
- A I only
- B II only
- C I and II only
- D II and III only
- E I,IIandIII