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


  • Options
  • A. 4/3
  • B. 2/3
  • C. 3/2
  • D. 3/4

  • Correct Answer
  • 3/4 

    Explanation

    Let S be the sample space.
    Here n(S)= 2 3  = 8
    Let E be the event of getting atmost two heads. Then,
    n(E) = {(H,T,T), (T,H,T), (T,T,H), (H,H,T), (T,H,H), (H,T,H)}
    Required probability = n(E)/n(S) = 6/8 = 3/4.

  • Tags: GRE, GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst

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