Calculate the probability of independent events occurring.
Parameters
Probability Analysis
Both Occur (A ∩ B)0.25(25.00%)
At Least One Occurs (A ∪ B)0.75(75.00%)
Not A (A')0.5
Neither Occurs0.25
Visual Probability Logic
Area of A
Area of B
About this calculator
Overview
Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur. This calculator focuses on independent events, where the outcome of one does not affect the other.
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Pro Tips
Ensure your inputs are between 0 and 1 (inclusive).
For independent events, the probability of both occurring is found by multiplying their individual probabilities.
The probability of 'at least one' occurring is 1 minus the probability of neither occurring.
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Fun Facts
"The Gambler's Fallacy is the mistaken belief that if an event happens more frequently than normal now, it will happen less frequently in the future."
"A probability of 0 means the event is impossible, while 1 means it is certain."
"The word 'probability' derives from the Latin 'probabilitas', which can also mean 'probity', a measure of the authority of a witness."
Formula: P(A ∩ B) = P(A) × P(B)
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
