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In how many of the integers between 1 and 100 does the digit 5 occur exactly onc
In how many of the integers between 1 and 100 does the digit 5 occur exactly onc
游客
2024-01-12
29
管理
问题
In how many of the integers between 1 and 100 does the digit 5 occur exactly once?
选项
A、10
B、18
C、19
D、20
E、21
答案
B
解析
在1至100之间的数字中,5仅在它们中出现1次的整数有多少?
解:本题的正确答案是(B)。解答本题的关键是考生一定要记住5只能在这些数字中出现1次,5在其中出现两次的数字应排除掉,即5要么在个位,要么在十位,个位与十位都出现5的数字(55)应排除掉。个位上有5的数字是:5,15,25,35,45,65,75,85和95;十位上有5的数字是:50,51,52,53,54,56,57,58和59,一共是18个。
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