Yolanda is to list consecutive positive integers starting from 1. If digit “4” a

游客2025-02-23 15

问题 Yolanda is to list consecutive positive integers starting from 1. If digit “4” appears 14 times, what is the last integer in her list?

选项 A、46
B、47
C、48
D、49
E、The answer cannot be determined from the information given.

答案 C

解析本题可使用列举法答题。从1开始列举：1到10中，只有4含有数字4，有1个；11到20中，只有14含有数字4，有1个；21到30中，只有24含有数字4，有1个；31到40中，只有34和40含有数字4，有2个；41到49中，有10个数字含有4(44是2个4)。第14次出现“4”的数是48，第15次出现“4”的数是49。因此，列表中最后出现数字4的数是48。故答案为C。

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