Probability Calculator
For equally likely outcomes, probability is the number of favorable outcomes divided by the number of possible outcomes.
Classical probability assumes equally likely outcomes. A fair die has P(six) = 1/6.
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Example problems
How this solver works
- This first version evaluates numeric probability expressions such as 1/6 or 0.5.
Formula
Equally likely sample space S.
Worked examples
fair die, one face
- 1/6
Answer: 1/6
Common mistakes
Probabilities over 1
A probability is between 0 and 1 inclusive.
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Frequently asked questions
Independent events?
P(A and B) = P(A)P(B) only when A and B are independent.