10TH•Mathematics•Probability•12.2 Addition Law of Probability

12.2 Addition Law of Probability

Addition law, Venn diagrams; Examples 8–10; EXERCISE 12.2.

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(i) If $A$ and $B$ are any two non mutually exclusive events then

$P(A \cup B) = P(A) + P(B) - P(A \cap B)$

(ii) If $A$ and $B$ are any two mutually exclusive events then

$P(A \cup B) = P(A) + P(B)$

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