New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A fair coin is tossed 6 times. What is the probability

    of getting exactly either two or three heads?
    A 35/64 Correct Answer Incorrect Answer
    B 25/64 Correct Answer Incorrect Answer
    C 15/32 Correct Answer Incorrect Answer
    D 5/16 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Since a fair coin is tossed 6 times hence total number of possible outcomes = 2 6  = 64

    Total number of ways of getting either two or three heads = 6C2  +  6C3  = (15 + 20) = 35

    Hence required probability = 35/64

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