题目信息
Sid intended to type a seven-digit number, but the two 3's he meant to type did not appear. What appeared instead was the five-digit number 52115. How many different seven-digit numbers could Sid have meant to type?
A:10
B:16
C:21
D:24
E:27
参考答案及共享解析

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已选答案:
正确答案:
C:21
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题目来源
Magoosh