An infinite sequence of positive integers is called an "alpha sequence" if the number of even integers in the sequence is finite. if S is an infinite sequence of positive integers , is S an alpha sequence?
(1)the first ten integers in S are even
(2)an infinite number of integers in S are odd
答案是E.
我不了解这题的意思,请各位大侠帮忙.
谢谢~~
如果一个无穷数列含有的偶数个数是有限的,那么这个数列就叫做 alpha sequence
由1)不能推出剩下的数是否含有无穷多个偶数
由2)S里有无穷多个奇数,仍然推不出偶数是否是有限个
1)、2)加起来,还是推不出
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