c*******g
发帖数: 151 | 1 小孩做GT三年级的数学题,答案和老师的不一样.
小孩选B,老师说是C,小孩丢分.
老师的解释: "For the question, you do not know what you will get when you
take out a ball. So you have to think of the worst case scenario so to
guarantee the result. Your scenario is not the worst."
我的答复给老师:
From the question itself, it says ""what is the least number of gumballs....
..". "Least" from Webster's 1913 Dictionary is defined as "Smallest, either
in size or degree".
Since we all know 13 is less than 16, then 13 should be the correct answer.
If based on your logic "have to think of the worst case scenario so to
guarantee the result", then 16 is the answer to question "what is the most
number of gumballs" John has to pick to be sure of getting one of each color.
这里有高手吗,给分析分析.
原题如下:
John has 20 gumballs in a bag. He knows there are 8 red, 7 white, and 5
green. If John can only pick the gumballs in the bag without looking, what
is the least number of gumballs he must pick from the bag to be sure of
getting one of each color?
A: 3
B: 13
C: 16
D. 20 | p*******o
发帖数: 6791 | 2 肯定是16啊，这个有啥争议？如果你运气不好死活拿不到绿的，至少要把红的和白的拿
完了，才能保证拿到绿的啊... | n****n
发帖数: 5817 | 3 这次我完全赞同你的说法！
【在 p*******o 的大作中提到】
: 肯定是16啊，这个有啥争议？如果你运气不好死活拿不到绿的，至少要把红的和白的拿
: 完了，才能保证拿到绿的啊...
| c*******g
发帖数: 151 | 4 谢谢鸭子,那我要是开始5个都是绿的,然后7个都是白的,第十三个是不是红的呀?
要保证三色都有, 那"the least number of gumballs to pick" ,是不是13个呀?
欢迎大家指点,谢谢.
【在 p*******o 的大作中提到】
: 肯定是16啊，这个有啥争议？如果你运气不好死活拿不到绿的，至少要把红的和白的拿
: 完了，才能保证拿到绿的啊...
| c*******g
发帖数: 151 | 5 看来问题出在"to be sure of "这里.
【在 p*******o 的大作中提到】
: 肯定是16啊，这个有啥争议？如果你运气不好死活拿不到绿的，至少要把红的和白的拿
: 完了，才能保证拿到绿的啊...
| p*******o
发帖数: 6791 | 6 但是你不能保证开始5个一定是绿的，所以你在第13个，没有办法 to be sure of
getting one of each color ，人家是要能 the least number of balls to pick to
BE SURE OF...
【在 c*******g 的大作中提到】
: 谢谢鸭子,那我要是开始5个都是绿的,然后7个都是白的,第十三个是不是红的呀?
: 要保证三色都有, 那"the least number of gumballs to pick" ,是不是13个呀?
: 欢迎大家指点,谢谢.
| n***y
发帖数: 15001 | | b*******s
发帖数: 4618 | 8 老师说的是对的， 需要取16个球才可以保证每个颜色至少有一个。
要考虑最坏的可能性。
..
either
.
【在 c*******g 的大作中提到】
: 小孩做GT三年级的数学题,答案和老师的不一样.
: 小孩选B,老师说是C,小孩丢分.
: 老师的解释: "For the question, you do not know what you will get when you
: take out a ball. So you have to think of the worst case scenario so to
: guarantee the result. Your scenario is not the worst."
: 我的答复给老师:
: From the question itself, it says ""what is the least number of gumballs....
: ..". "Least" from Webster's 1913 Dictionary is defined as "Smallest, either
: in size or degree".
: Since we all know 13 is less than 16, then 13 should be the correct answer.
| c*******g
发帖数: 151 | 9 "to BE SURE OF", that is the key point, thanks 肥鸭.
to
【在 p*******o 的大作中提到】
: 但是你不能保证开始5个一定是绿的，所以你在第13个，没有办法 to be sure of
: getting one of each color ，人家是要能 the least number of balls to pick to
: BE SURE OF...
| c*******g
发帖数: 151 | 10 谢谢.
【在 n***y 的大作中提到】
: C
| c*******g
发帖数: 151 | 11 谢谢.
【在 b*******s 的大作中提到】
: 老师说的是对的， 需要取16个球才可以保证每个颜色至少有一个。
: 要考虑最坏的可能性。
:
: ..
: either
: .
| h********n
发帖数: 5148 | | w********0
发帖数: 1995 | | n******r
发帖数: 9146 | 14 least在原题里用的比较容易误会。理解成"至少要拿多少个球" 好些。
..
either
.
【在 c*******g 的大作中提到】
: 小孩做GT三年级的数学题,答案和老师的不一样.
: 小孩选B,老师说是C,小孩丢分.
: 老师的解释: "For the question, you do not know what you will get when you
: take out a ball. So you have to think of the worst case scenario so to
: guarantee the result. Your scenario is not the worst."
: 我的答复给老师:
: From the question itself, it says ""what is the least number of gumballs....
: ..". "Least" from Webster's 1913 Dictionary is defined as "Smallest, either
: in size or degree".
: Since we all know 13 is less than 16, then 13 should be the correct answer.
|
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