【GMAT考满分数学PS题库】If r, s, and t are consecu_真题_答案_解析 GMAT考满分官网

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题目内容

If r, s, and t are consecutive even integers and $r < s < t$ , which of the following must be true?

$t - r = 4$
$(s - r) t$ is an even integer.
$\frac{r + s + t}{3}$ is an even integer.

A
I only
B
II only
C
I and II only
D
II and III only
E
I, II, and III

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正确答案: E

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