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JEE Main & Advanced Mathematics Sets Question Bank Self Evaluation Test - Sets

  • question_answer
    20 teachers of a school either teach mathematics or physics. 12 of them teach mathematics while 4 teach both the subjects. Then the number of teachers teaching physics only is

    A) 12

    B)                                8

    C) 16

    D)                                None of these

    Correct Answer: B

    Solution :

    [b]Let n(P) = Number of teachers in physics \[n(M)=\]Number of teachers in Maths \[n(P\cup M)=n(P)+n(M)-n(P\cap M)\] \[20=n(P)+12-4\Rightarrow n(P)=12\] Only Physic?s teacher = 8


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