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In how many of the whole numbers between 100 and 200 does the digit 6 occur exac
In how many of the whole numbers between 100 and 200 does the digit 6 occur exac
游客
2024-01-12
54
管理
问题
In how many of the whole numbers between 100 and 200 does the digit 6 occur exactly once?
选项
A、18
B、20
C、10
D、9
E、19
答案
A
解析
106，116，126，…，196共10个数，但是166不算，10-1=9；160，161，162，…，169共10个数，但是166不算，10-1=9。所以一共为9+9=18个数，选择A。
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