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JEE Main & Advanced Mathematics Probability Question Bank Definition of probability

  • question_answer
    A coin is tossed until a head appears or until the coin has been tossed five times. If a head does not occur on the first two tosses, then the probability that the coin will be tossed 5 times is                                              [CEE 1993]

    A)                 \[\frac{1}{2}\]       

    B)                 \[\frac{3}{5}\]

    C)                 \[\frac{1}{4}\]       

    D)                 \[\frac{1}{3}\]

    Correct Answer: C

    Solution :

                    \[P\] (tail in 3rd) .\[P\](tail in 4th) \[=\frac{1}{2}.\frac{1}{2}=\frac{1}{4}\].


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