2. 外语
  3. In how many of the whole numbers between 100 and 200 does the digit 6 occur exactly once?

In how many of the whole numbers between 100 and 200 does the digit 6 occur exactly once?

admin2022-11-20  28
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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