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एक यादृच्छिक प्रयोग में A तथा B दो घटनाय...

एक यादृच्छिक प्रयोग में A तथा B दो घटनाये है कि `P(A" या "B)=0.7" तथा "P(A" तथा "B)=0.3" तथा "P(bar(A))=0.4` तो P(B) ज्ञात कीजिए।

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