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题目内容双击单词支持查询和收藏哦～
Sid intended to type a seven-digit number, but the two “3” 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?
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· 相关考点
6.3.8 其他特殊排列组合技巧
6.3.8 其他特殊排列组合技巧
以上解析由 考满分老师提供。
