3 Cards are drawn randomly from 52 playing cards.
Given that all 3 cards are of same suit (同花)
Find the probability that all of them are face cards.
Probability
2012-09-01 8:30 pm
回答 (1)
2012-09-01 9:02 pm
✔ 最佳答案
P(all of them are face cards)= P(3 face cards are of same suit) / P(3 cards are of same suit)
P(K♠ Q♠ J♠ or K♥Q♥J♥ or K♣ Q♣ J♣ or K♦ Q♦ J♦ )
= ───────────────────────────────
P(3 ♠ cards out of 13 or 3 ♥ cards out of 13
or 3 ♣ cards out of 13 or 3 ♦ cards out of 13 )
4 / 52C3
= ────────────
4 *13C3 / 52C3
= 1 / 13C3
= 1 / 286
收錄日期: 2021-04-21 22:26:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120901000051KK00270