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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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