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2) A Í B, P (A) £ P (B):
1 1.
P (A) + P (B - A) = P (B)
P (B - A) ³ 0, P (A) £ P (B) ¢.
3)" A Î A Þ 0 £ P (A) £ 1 :
A Í W Þ P (A) £ P (W), P (W) = 1( 2)
P (A) ³ 0, " A Î A( 1) ¢.
4) P (Ā) = 1 - P (A) : A + Ā = W, A × Ā = Æ
3 2
P (A + Ā) = P (W), P (A) + P (Ā) = P (W), P (A) + P (Ā) = 1 Þ P (Ā) = 1 - P (A) ¢.
5) P (Æ) = 0:Æ + W = W 3 2 , P (Æ) + P (W) = P (W) Þ
P (Æ) + 1 = 1, P (Æ) = 0 ¢.
6) " A, B Î A: P (A + B) = P (A) + P (B) P (AB)
:
A + B = A + (B - AB), A ×(B - AB) = Æ
P (A + B) = P (A) + P (B - AB), AB Í B ( ).
P (A + B) = P (A) + P (B) P (AB) ¢.
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11. A B , P(B)>0 Þ$ P(A½B). A B, P(A½B) = P(A) P(A)>0,
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