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累感不爱!又一道让所有人抓狂的小学数学题

,成长吧啊,www.czbaa.com,数学

日前,新加坡一名电视主持人在脸书上发布了这么一道数学题,结果和蓝金裙子一样又引发了网上的新一轮大战。你的数学是体育老师教的吗?那么让我们一起来看看这道关于Cheryl生日的数学题。

初看这个问题会觉得根本无解,但是开动脑筋你会发现这只是一道简单的逻辑题。在看答案之前先自己思考一下。

Alberty (以下简称A)和Bernard (以下简称B) 认识了一个叫Cheryl (以下简称C) 的朋友,他们两个都很想知道C的生日是哪一天。C于是给了他们10个可能的日期。

5月15日, 5月16日, 5月19日

6月17日, 6月18日

7月14日, 7月16日

8月14日, 8月15日, 8月17日

然后C分别告诉了A是哪一个月,告知了B是具体是哪一天。接着:

A说:“我不知道C的生日,但我确定B可定也不知道。”

B说:“刚开始我也不知道是哪一天,现在我知道了。”

A说:“那我现在也知道了。”

又一道让所有人抓狂的小学数学题

好了,告诉我答案是什么?有答案么?究竟是哪一天呢?

有个解答可能是AB两人不会再和C一起愉快的玩耍了,没有人对这种用如此丧心病狂的问题来介绍自己的装13 人士感冒吧。

由新加坡的STUDY ROOM 提供的答案如下:

根据对话第一句,A确定B不知道生日具体是哪天,那么就能排除5月和6月,因为18号、19号是独立的没有重复的两天。换句话说,如果A得知的月份是5月或6月,那么他就不能判断B不知道生日是哪天了,因为B可以通过18、19来确定。

接下来第二句,B从A的话排除了5月和6月,所以他知道了准确日期。由此可推断生日一定是在7月16日、8月15日和8月17日三天里面,如果是14号的话,B就无法判断出来了。

最后一句话A说他也知道了具体日期,可见答案就是7月16日。

这道题最开始以为是出给小学5年级的题目,后来澄清说出自新加坡和东盟学校数学奥林匹克竞赛(SASMO)的14岁竞赛题。如果你做出来了,恭喜,你要比14岁的孩子聪明。

又一道让所有人抓狂的小学数学题

以为这就完了吗?SASMO对于争论看不下去了,公布了正确答案事实上是: 8月17号。累感不爱。  来源:煎蛋

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