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标题: prep ds196 [打印本页]

作者: cindytim 时间: 2010-3-21 12:35
标题: prep ds196
How many odd integers are greater than the integer x and less than the integer y ?

(1)There are 12 even integers greater than x and less than y.

(2)There are 24 integers greater than x and less than y.

--------------------------------------------------------------------------------------------------------------------------------------------------------【答案】B

【思路】

(1) 不知道有幾個數是介於x,y. 有可能奇數比偶數多1或少1

(2) 有一半是奇數

题目没有说是连续的，怎么得出一半奇数，一般偶数

作者: 切尔西 时间: 2010-3-21 13:54
比较两个数间的数，比一个大，比另外一个小，没有办法做到不连续的哈，就好比比10大，比20小的数，不可能把5或者22插进去撒

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