作者betray911015 (回头太难)
看板Statistics
标题[问题] 简单机率
时间Wed Jul 6 23:42:32 2011
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Three cards are randomly selected, without replacement,
from an ordinary deck of 52 cards.
1.What is the probability that all three cards are spades?
2.What is the probability the three cards contain one pair or
three of a kind?
我不是很懂第一个题目在问什麽? spade是什麽意思?/
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◆ From: 111.252.36.50
1F：→ ASD332:黑桃 07/06 23:46
2F：推 celestialgod:1. 13C3/52C3 (十三张黑桃取三/总数) 07/07 00:38
3F：→ celestialgod:2. (4C2*13C1*12C1*4C1+13C1*4C3)/52C3 07/07 00:40