如果从一副 52 张牌中随机选择，不选国王的概率是多少？
事件 A 的概率通常写为 P(A)。这里，P 代表可能性，A 代表事件。它说明事件即将发生的可能性。事件的概率只能存在于 0 和 1 之间，其中 0 表示事件不会发生，即不可能，1 表示肯定会发生，即确定性。
如果不确定事件的结果，请借助某些结果的概率，以及它们发生的可能性。为了正确理解概率，以抛硬币为例，会有两种可能的结果——正面或反面。
概率公式
Probability of an event, P(A) = Favorable outcomes / Total number of outcomes
从一副牌中随机选择一张牌：
众所周知，一副洗好的牌有 52 张牌，因此牌的总数为 52。所有牌进一步分为花色（其中 4 种：黑桃、红心、方块、梅花），每张 13 张牌。每套花色有 13 张牌（A、2 到 10、Jack、Queen、King）。因此，结果总数将是 52。在 52 个中，King、Queen 和 Jack（或 Knaves）是面卡。在 52 张扑克牌中，总共有 12 张面牌。
使用概率公式，我们可以找到从 52 张牌中随机抽取的牌的概率：
事件的概率，P(A) = 有利结果/结果总数。
示例：从 52 张牌中选出第 4 张牌的概率是多少？
解决方案：
It is known that a well-shuffled deck has 52 cards
Total number of cards = 52
further divided into suits (4 of them: Spades, Hearts, Diamonds, Clubs) of 13 cards each.
And Each suit has 13 cards (A, 2 to10, Jack, Queen, King).
So , total number of outcome = 52
probability of getting 4 = 4
Total number of outcomes =52
so probability of having number 4 card is = Probability of an event, P(A)
= Favorable outcomes / Total number of outcomes.
= 4/52
= 1/13
如果从一副 52 张牌中随机选择，不选国王的概率是多少？
解决方案：
In one pack of cards there are 4 kings in a deck of 52,
therefore , the probability of drawing a king is = Probability of an event, P(A)
= Favorable outcomes / Total number of outcomes
= 4/52
= 1/13
Hence, the probability of not picking a king P(B) = 1 – P(A)
= 1 – 1/13
= 12/13
Therefore the probability of not picking a king if you choose randomly from a pack of 52 cards is 12/13
类似问题
问题 1：从一副 52 张牌中抽出一张牌时，得到红心或 J 的概率是多少？
解决方案：
It is known that a well-shuffled deck has 52 cards
Total number of black cards = 26
Total number of red cards = 26
further divided into suits (4 of them: Spades, Hearts, Diamonds, Clubs) of 13 cards each.
And Each suit has 13 cards (A, 2 to10, Jack, Queen, King).
So , total number of outcome = 52
probability of getting either a heart or a jack?
probability of getting a heart = 13
probability of getting a jack = 4
And probability of getting a jack of heart = 1
Therefore probability of getting a heart = {total number of heart cards in the deck}/{total number of cards in the deck}
= 13/52
Probability of getting a heart = 1/4
And the probability of getting either a jack = {total number of jack cards in the deck}/{total number of cards in the deck}
= 4/52
Probability of getting a jack = 1/13
probability of getting a jack of heart = {total number of jack of heart in the deck}/{total number of cards in the deck}
= 1/52
问题2：得到女王的概率是多少？
解决方案：
Total number of cards are 52
number of queens are 4
So, total outcomes = 52
favorable outcomes = 4
So, the probability of getting a queen = Favorable outcomes / Total outcomes
= 4 / 52
P = 1/13
therefor the probability of getting queen is 1/13
问题 3：从一副洗好的 52 张牌中抽到一张红牌的概率是多少？
解决方案：
We know that a well-shuffled deck has 52 cards
Total number of black cards = 26
Total number of red cards = 26
Therefore probability of getting a red card = {total number of red cards in the deck}/{total number of cards in the deck}
= 26/52
= 1/2
So the probability of having red card is 1/2
问题4：得到黑皇后的概率是多少？
解决方案：
Total number of cards = 52
Number of favorable cards that are black queen = 2
so, probability of getting a black queen = 2/52
Therefore, probability of getting a black queen = 2/52
P(E) = probability of getting a black queen
= 2/52
= 1/26
so the probability of getting a black queen is 1/26
问题5：得到黑桃皇后的概率是多少？
解决方案：
Total number of cards = 52
Total spades cards are 13 ..
Number of favorable cards that are queen of spades = 1
so, probability of getting a spade queen = 1/52
Therefore, probability of getting a spade queen = 1/52
P(E) = probability of getting a spade queen
= 1/52
so the probability of getting a spade queen is 1/52
问题 6：有一张 4 的钻石牌的概率是多少？
解决方案：
It is known that a well-shuffled deck has 52 cards
Total number of cards = 52
further divided into suits (4 of them: Spades, Hearts, Diamonds, Clubs) of 13 cards each.
And Each suit has 13 cards (A, 2 to10, Jack, Queen, King).
So , total number of outcome = 52
number of favorable outcome of having 4 of diamond card = 1
therefore the probability of having 4 of diamond card = number of favorable outcome / total number of outcome
= 1/52
= 1/52
问题7：获得黑脸卡的概率是多少？
解决方案：
It is known that a well-shuffled deck has 52 cards
Total number of cards = 52
further divided into suits (4 of them: Spades, Hearts, Diamonds, Clubs) of 13 cards each.
And Each suit has 13 cards (A, 2 to10, Jack, Queen, King).
So , total number of black cards = 13 of spades and 13 of clubs = 26
out of these 26 black cards total face cards are = 6
number of favorable outcome of having black face card = 6
therefore the probability of having 4 of diamond card = number of favorable outcome / total number of outcome
= 6/52
= 3/26