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एक यादृच्छिक प्रयोग से सम्बन्धित दो घटना...

एक यादृच्छिक प्रयोग से सम्बन्धित दो घटनाएँ A व B इस प्रकार है, कि `P(B)=0.35, P(A" या "B)=0.85" तथा "P(A" और "B)=0.15` तो P(A) का मान ज्ञात कीजिए |

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