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GRE数学真题
Sid intended to type a seven-digit number, but the two 3's he meant to type did ...
Question 5
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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
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