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

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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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