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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
20
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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