12th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-5

  • question_answer
    If A and B are two events, then \[\mathbf{P}\left( \mathbf{A}\cap \mathbf{B} \right)=\]

    A)  \[P\left( \overline{A} \right).P\left( \overline{B} \right)\]                  

    B)   \[1-P\left( \overline{A} \right)-P\left( \overline{B} \right)\]

    C)  \[P\left( B \right)-P\left( A\cap B \right)\]   

    D)  \[P\left( A \right)+P\left( B \right)-P\left( A\cap B \right)\]

    Correct Answer: C

    Solution :

    [c] \[\because P\left( \overline{A}\cap B \right)\] \[=P\left[ \left( B-A\cap B \right)\cap B \right]\] \[=P\left[ \left( B \right)-\left( A\cap B \right) \right]\] \[=P\left( B \right)-P\left( A\cap B \right).\]


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