Re: [理工] [離散] 98台大電機
※ 引述《ceo890710 (Drinking)》之銘言：
: Let's define set S by 3(屬於)S ; a+b(屬於)S if a(屬於)S and b(屬於)S
: Which of the following statements is true?
: (a) S is a empty set
: (b) S is the set of integers that are not divisible by 3
: (c) S is the set of positive integers divisible by 3
: (d) S is the set of all positive integers
: (e) None of the above
: 我看解答給的答案是C，想說只有那三個條件怎麼能確定都是3的倍數呢
不好意思問一下
這題沒說一定是三的倍數吧@@?
取a=1屬於S b=2屬於S
a+b=3也屬於S
這時候
3&1都屬於S ==> 3+1=4都屬於S
以此類推 所有整數都應該屬於S才對吧!?
所以..正解是選項沒有正確答案QQ?
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※ 編輯: RichLowkey56 來自: 122.116.13.191 (08/01 23:26)
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