题目信息
$$10^{x} + 10^{y} + 10^{z} = n$$, where x, y, and z are positive integers. Which of the following could be the total number of zeroes, to the left of the decimal point, contained in n?
I. x + y
II. y – z
III. z
I. x + y
II. y – z
III. z
A:III only
B:I and II only
C:I and III only
D:II and III only
E:I, II, and III
参考答案及共享解析

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已选答案:
正确答案:
E:I, II, and III
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题目来源
Magoosh