c********t
发帖数: 4527 | 1 a bag has 9 pairs of gloves in the two colors red or green (a pair consist
of two gloves with the same color, left and right).
What's the minimal number of gloves if I pull out from the bag, that I
know that the gloves I pull out from bags are pairs.
There is a follow up question once we have it answered. |
i**9
发帖数: 351 | |
c********t
发帖数: 4527 | 3 how?
reasons?
thanks
【在 i**9 的大作中提到】
: isn't it 10?
|
B*****g
发帖数: 34098 | 4 1. 拿10个一定有一个是一双出来的。
2. 拿9个不一定有一双，比如拿了9个左手。
【在 c********t 的大作中提到】
: how?
: reasons?
: thanks
|
m****u
发帖数: 229 | 5 choosewhat,
My answer is 2 gloves are needed to satsify the min requirement of same
color and one left hand and one right hand glove.
But I agree with icn9's answer.
your question is so misleading or my English fails.
Is this your freshman course homework? |
c********t
发帖数: 4527 | 6 hehe,
I guess yours as suck as mine.
I don't get what you are saying neither.
Let's focus on the question.
If the answer 10 means that at least that you have a pair at hand
sure, but I am not sure that's the question about.
then what color (red, green) applies here in the question?
【在 m****u 的大作中提到】
: choosewhat,
: My answer is 2 gloves are needed to satsify the min requirement of same
: color and one left hand and one right hand glove.
: But I agree with icn9's answer.
: your question is so misleading or my English fails.
: Is this your freshman course homework?
|
m****u
发帖数: 229 | 7 I said 2 because 2 gloves are needed to make a pair. And yes, i know the
chance of geetting 2 gloves that are in the same color and one is left hand
one and another is right hand one is less than 100% which means this can
happen but it doesn't always happen.
And I think based on your wording, the color and left/right hand info are
not important, I think it's just a way to misguide me.
icn9's answer promises you a pair of gloves with the same color and one is
right hand and one is left hand at the chance of 100%.
My answer doesn't promise 100% but it does have a slim chance to see it from
happening. When I read your wording I dont think you didn't ask for it to
happen 100%, you just want to have a chance to get it happen. |
h***n
发帖数: 276 | 8 抽屉原理阿，就是10乐 (9+1)，最少的数目保证一定有配对的
【在 c********t 的大作中提到】
: how?
: reasons?
: thanks
|
c********t
发帖数: 4527 | 9 what's 抽屉原 in English?
If it is 抽屉原, the question is so simple.
Maybe the question is
"How many gloves that I need to pull out from bag so that I am sure that
AT LEAST that I have pair at hand"
if so it is 抽屉原 and the answer is 10 no matter what
【在 h***n 的大作中提到】
: 抽屉原理阿，就是10乐 (9+1)，最少的数目保证一定有配对的
|
c********t
发帖数: 4527 | 10 what's 抽屉原 in English?
If it is 抽屉原, the question is so simple.
Maybe the question is
"How many gloves that I need to pull out from bag so that I am sure that
AT LEAST that I have pair at hand"
if so it is 抽屉原 and the answer is 10 no matter what
【在 h***n 的大作中提到】
: 抽屉原理阿，就是10乐 (9+1)，最少的数目保证一定有配对的
|
h***n
发帖数: 276 | 11 in English, it is called "pigeonhole principle"
【在 c********t 的大作中提到】
: what's 抽屉原 in English?
: If it is 抽屉原, the question is so simple.
: Maybe the question is
: "How many gloves that I need to pull out from bag so that I am sure that
: AT LEAST that I have pair at hand"
: if so it is 抽屉原 and the answer is 10 no matter what
|
c********t
发帖数: 4527 | 12 thanks
【在 h***n 的大作中提到】
: in English, it is called "pigeonhole principle"
|
