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Classical Probability Calculator

Online classical probability: with finite equally-likely outcomes, P(A)=favorable m / total n.

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P(A)=m/n
Total
Favorable

📖 Tutorial | Classical Prob

1. Definition
If outcomes are finite and equally likely, P(A)=m/n with m favorable and n total.
2. Formula & Notation
n,mTotal, favorable
3. Properties & Laws
  • Finite, equally likely;
  • 0≤P≤1;
  • Complement 1−P;
  • Certain 1, impossible 0.
4. Steps
  1. Enter n,m;
  2. Click "Calculate";
  3. Or click "Load Example".
5. Worked Examples
Example: even roll: 3/6=0.5.
6. Common Pitfalls
Must be equally likely;
Count without overlap;
m≤n.

❓ FAQ | Classical Prob

Condition?
Equally likely.
Formula?
m/n.
Range?
0-1.
Complement?
1−P.
Example?
0.5.
Not equal?
Cannot use.