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Discussion :: Probability

  1. Three unbiased coins are tossed. What is the probability of getting at most two heads?

  2. A.

    34

    B.

    14

    C.

    38

    D.

    78

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    Answer : Option D

    Explanation :

    Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}

     

    Let E = event of getting at most two heads.

     

    Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}.

     

     P(E) = n(E)n(S) =78

     


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