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    Question

    If a coin is tossed 10 times then what is the

    probability of getting three heads?
    A 5/128 Correct Answer Incorrect Answer
    B 15/128 Correct Answer Incorrect Answer
    C 13/128 Correct Answer Incorrect Answer
    D 17/128 Correct Answer Incorrect Answer

    Solution

    Total sample spaces = 2¹⁰ Total favourable events N(P) = ¹⁰C₃  Probability (E) = (N(P))/(N(S)) = (¹⁰C₃ )/(2¹⁰) = (¹⁰C₃ )/(2^5.  2⁵) = ((10  ×  12 )/(3  ×  2))/(32  ×  32) = (10  ×  12)/(32 ×  32) = 15/128

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