一道英语IQ题,求解答
算出来两个答案,你说的答案是17,我算出来 17,18 好像都行。
题目大概意思就是
在一个房间里,有外星人。外星人的手指总数在200到300间。每个外星人的每只手的手指数都大于1,每个外星人的每只手的手指数各不相同,并且每个外星人的手指总数是相同的。问房间里有多少外星人?
以下是分析:
当然题目暗含的意思应该是一个外星人有两只手,根据题目中没有对此特别说明,并且用的是alien fingers这样的表述(而题目中没有提到什么alien hands之类的)。个人这样认为。
那么受 stone_仅仅 的启发,我也进行了计算。
一个外星人两只手的手指总数为5,一只手与另一只手的手指数目分别是(2,3)
(3,2)
这样只有2个外星人,与手指总数在200与300间不符。
.
.
.
一个外星人两只手的手指总数为10,一只手与另一只手的手指数目分别是(2,8)
(3,7)
(4,6)
(6,4)
(7,3)
(8,2)
(无5,5),因为根据题目两只手手指数目不同。共6种情况,与手指总数在200与300间不符。
.
.
.
一个外星人两只手的手指总数为17,一只手与另一只手的手指数目分别是(2,15)
......
......
(15,2)
共14种情况,14*17=238 ,符合手指总数在200与300间。
.一个外星人两只手的手指总数为18,一只手与另一只手的手指数目分别是(2,16)
......
......
(16,2)
(无8,8),共14种情况,14*18=252 ,符合手指总数在200与300间。
一个外星人两只手的手指总数为19,会超出。
所以17,18好像都行。
大家可以再来讨论下。
古钟停了他怎么知道几点
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