Probability · Classes 11, 12
Addition Rule
Probability of A or B.
FORMULA
\(P(A\cup B)=P(A)+P(B)-P(A\cap B)\)
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Enter values to see a result and calculation steps.
Worked example
0.4+0.5−0.1=0.8
Understand this formula
Probability of A or B.
Check measurement units, mathematical domains and rounding before applying any result in an examination.