GMAT 考满分题库

Magoosh - 数学PS - 276
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?
  • A10
  • B16
  • C21
  • D24
  • E27
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正确答案: C

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