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GATE Notes,
Probability Formulas
Probability Range
0 ≤ P(A) ≤ 1
Rule of Complementary Events
P(Ac) + P(A) = 1
Rule of Addition
P(AB) = P(A) + P(B) – P(AB)
Disjoint Events
Events A and B are disjoint iff
P(AB) = 0
Independent Events
Events A and B are independent iff
P(AB) = P(A) P(B)
Conditional Probability

P(A | B) = P(AB) / P(B)

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