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A person counts positive integers from 1 to X. Which of the following statements could determine X?
Indicate all that is/are true.
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A.2 appears for 15 times on all digits
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B.5 appears for 15 times on all digits
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C.8 appears for 9 times on all digits, while 9 appears for 8 times on all digits
B,C显示答案
