Probability Calculator (Two Events: And, Or, Not)
Probability calculator for two independent events: P(A and B), P(A or B), exactly one, neither, complements, and repeated trials.
P(A ∩ B) = P(A)·P(B) · P(A ∪ B) = P(A) + P(B) − P(A ∩ B)
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
For independent events P(A and B) = P(A) × P(B) and P(A or B) = P(A) + P(B) − P(A and B). The chance of at least one success in n tries is 1 − (1 − p)ⁿ.
Frequently asked questions
P(A) = 50 %, P(B) = 30 %?
Both: 15 %; either: 65 %; neither: 35 %.
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