概率计算器

我们的免费概率计算器是快速、准确且无限计算的终极在线数学工具。无需登录，即可解决从简单事件到条件场景的复杂概率问题。这款必备数学计算器节省时间、提升学习效果，同样支持学生、专业人士和业余爱好者的数据驱动决策。

单一事件概率计算器

结果
单一事件概率	值（小数）	值（百分比）
P(E)	-	-
P(E')	-	-

概率公式

The Single Event Probability Calculator uses the following formulas:

P(E) = n(E) / n(T) = (number of outcomes in the event) / (total number of possible outcomes)

P(E') = P(not E) = 1 - P(E)

Where:

P(E) is the probability that the event will occur,

P(E') is the probability that the event will not occur,

n(E) is the number of outcomes in the event E,

n(T) is the total number of possible outcomes.

多重事件概率计算器（A和B是独立事件）

结果
多重事件概率	值（小数）	值（百分比）
P(A)	-	-
P(A')	-	-
P(B)	-	-
P(B')	-	-
P(A ∩ B)	-	-
P(A ∪ B)	-	-
P(A \| B)	-	-
P(B \| A)	-	-

概率公式

The Multiple Event Probability Calculator uses the following formulas:

P(A) = n(A) / n(T)

P(A') = P(not A) = 1 - P(A)

P(B) = n(B) / n(T)

P(B') = P(not B) = 1 - P(B)

P(A ∩ B) = P(A) × P(B)

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

P(A | B) = P(A ∩ B) / P(B)

P(B | A) = P(A ∩ B) / P(A)

Where:

P(A) is the probability that event A occurs,

P(A') is the probability that event A does not occur,

P(B) is the probability that event B occurs,

P(B') is the probability that event B does not occur,

P(A ∩ B) is the probability that events A and B both occur,

P(A ∪ B) is the probability that events A or B occur,

P(A | B) is the probability that event A occurs, given that event B has occurred,

n(A) is the number of outcomes in the event A,

n(B) is the number of outcomes in the event B,

n(T) is the total number of possible outcomes.

如何使用概率计算器

在上方的概率计算器输入框中输入数值。
点击计算按钮，立即获取结果。
查看输出结果，调整输入以比较不同场景。