r********n
发帖数: 6979 | 1 Ray is trying to avoid buying his wife the rare black pearls she wants for
Valentine's Day. He proposes a game: Ray puts 50 black pearls in a box and
50 fake white pearls in another. He says, "Divide the pearls any way you
want between the boxes. Then I'll blindfold you and shuffle the boxes. You
tap one box and pick a pearl from it. That's what you'll get."
The Question: Can Ray's long-suffering wife mix up the pearls to improve her
chances? |
h*****0
发帖数: 4889 | 2 1B | 49B50W
and
You
her
【在 r********n 的大作中提到】
: Ray is trying to avoid buying his wife the rare black pearls she wants for
: Valentine's Day. He proposes a game: Ray puts 50 black pearls in a box and
: 50 fake white pearls in another. He says, "Divide the pearls any way you
: want between the boxes. Then I'll blindfold you and shuffle the boxes. You
: tap one box and pick a pearl from it. That's what you'll get."
: The Question: Can Ray's long-suffering wife mix up the pearls to improve her
: chances?
|
f*****e
发帖数: 542 | 3 为什么？
【在 h*****0 的大作中提到】
: 1B | 49B50W
:
: and
: You
: her
|
a**u
发帖数: 813 | 4 ?
【在 h*****0 的大作中提到】
: 1B | 49B50W
:
: and
: You
: her
|
b*****g
发帖数: 919 | 5 这样就有 0.5 * 1 + 0.5 * (49/99) 的概率买黑的
【在 a**u 的大作中提到】
: ?
|
