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David is to list consecutive positive integers starting from 1.Quantity A: The
David is to list consecutive positive integers starting from 1.Quantity A: The
游客
2024-01-12
39
管理
问题
David is to list consecutive positive integers starting from 1.
Quantity A: The number of all possible candidates for the last integer in his list if digit “4” appears 15 time
Quantity B: The number of all possible candidates for the last integer in his list if digit “4” appears 16 times
选项
A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案
B
解析
本题同样可使用列举法答题。选项A: 从1开始的连续正整数中第15次出现数字4的数是49,第16次出现数字4的数是54,第17次出现数字4的数是64。选项B: 第15次出现数字4的数可以是49到53间的任意一个数,共5个可能的数字。选项C:第16次出现数字4的数可以是54到63间的任意一个数,共10个可能的数字。
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