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For a conditioning event with positive probability, the formula is $P(A\mid B)=P(A\cap B)/P(B)$. On a Venn diagram, the overlap region ($A \cap B$) serves as the numerator, and the entire conditioning region ($B$) serves as the denominator.

Conditions: The conditioning event B has a positive probability ($P(B) > 0$).

For a conditioning event with positive probability, the formula is $P(A\mid B)=P(A\cap B)/P(B)$. On a Venn diagram, the overlap region ($A \cap B$) serves as the numerator, and the entire conditioning region ($B$) serves as the denominator.

Conditions: The conditioning event B has a positive probability ($P(B) > 0$).