Set T is an infinite sequence of positive intergers. A "superset" is a sequence in which there is a finite number of mulltiples of three. Is T a superset?
(1) The fiirst six intergers in T are multiples of theee.
(2) An infinite number of integers in T are multiples of four.
看的有点莫名 为啥是E
题目的意思是,假设T是一个正整数的无穷数列,一个集的序列是3的倍数,请问T是这个集吗?
条件一,T的第六个整数是3的倍数,不代表整个T都是3的倍数;
条件二,T的无穷序列是4的倍数,虽然文字表达不是3的倍数,但有可能是3的倍数,例如3×4,3×8。。。。等等,以此类推就是3的倍数序列
条件一+条件二都无法得出T的序列一定是3的倍数
answer:E
谢谢!
可是(1) The fiirst six intergers in T are multiples of theee.
不是说前六个数都是3的倍数吗?那(2)给的条件结合起来不就是说T是12的倍数的集合吗?
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