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Paul is to list consecutive positive integers starting from 1. If digit “3” appe
Paul is to list consecutive positive integers starting from 1. If digit “3” appe
游客
2024-01-12
44
管理
问题
Paul is to list consecutive positive integers starting from 1. If digit “3” appears 16 times, what is the last integer in his list?
选项
A、38
B、39
C、43
D、53
E、The answer cannot be determined from the information given.
答案
E
解析
本题可使用列举法答题。从1开始列举:1到10中,只有3含有数字3,有1个;11到20中,只有13含有数字3,有1个;21到30中,只有23和30含有数字3,有2个;31到40中,有10个数字含有数字3(33是2个3);41到50中,只有43含有数字3,有1个;5l到60中,只有53含有数字3,有1个。从1到60的正整数中第16次出现“3”的数字是53,但继续往后数,第17次出现“3”的数字是63。因此,最后一位可以是53到62的任意一个数,无法判断。故答案为E。
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