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An identification code read from left to right consists of 2 digits, a dash, 3 d
An identification code read from left to right consists of 2 digits, a dash, 3 d
游客
2024-01-12
57
管理
问题
An identification code read from left to right consists of 2 digits, a dash, 3 digits, a dash, and then 4 digits. Each digit can be any number from 0 through 9.
Column A Column B
The number of different identification codes possible
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
C
解析
一个识别密码(identification code)从左至右包括2个数字,1个连字符号,3个数字,1个连字符号,然后是4个数字,每个数字可以是0至9的任一个。
解:本题的正确答案是(C)。题目中比较的左项是所有可能的密码数,dash指连字符号,如123-456中的“-”,它与密码数无关。密码中共有9个数字,每个数字都可能是0至9这10个数字中的一个,所以共有
种可能。
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