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  • Question
  • Three unbiased coins are tossed, what is the probability of getting exactly two heads?


  • Options
  • A. 1/3
  • B. 3/4
  • C. 2/3
  • D. 3/8

  • Correct Answer
  • 3/8 

    Explanation

    S= { HHH, HHT, HTH, THH, TTH, THT, HTT, TTT} and
    E = Event of getting exactly two heads = {HHT, HTH, THH}
    ? P(E) = n(E)/n(S) = 3/8


  • Probability problems


    Search Results


    • 1. 
      Three unbiased coins are tossed. What is the probability of getting at most 2 heads?

    • Options
    • A. 1/4
    • B. 3/8
    • C. 7/8
    • D. 1/2
    • Discuss
    • 2. 
      A bag contains 6 black balls and 8 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?

    • Options
    • A. 4/7
    • B. 3/4
    • C. 4/5
    • D. 1/8
    • Discuss
    • 3. 
      A bag contains 8 red and 5 white balls. 2 balls are drawn at random. What is the probability that both are white?

    • Options
    • A. 5/16
    • B. 2/13
    • C. 3/26
    • D. 5/39
    • Discuss
    • 4. 
      The odds against the occurrence of an event are 5 : 4. The probability of its occurrence is?

    • Options
    • A. 4/5
    • B. 4/9
    • C. 1/5
    • D. 1/4
    • Discuss
    • 5. 
      Ticket numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn bears a number which is a multiple of 3 or 7?

    • Options
    • A. 1/15
    • B. 1/2
    • C. 2/5
    • D. 7/20
    • Discuss
    • 6. 
      In a simultaneous throw of two coins, the probability of getting at least one head is?

    • Options
    • A. 1/2
    • B. 2/3
    • C. 3/4
    • D. 1/3
    • Discuss
    • 7. 
      In a throw of a coin, the probability of getting a head is?

    • Options
    • A. 1/2
    • B. 1/4
    • C. 1
    • D. None of these
    • Discuss
    • 8. 
      The probability that a teacher will give one surprise test during any class meeting in a week is 1/5. If a student is absent twice. What is the probability that he will miss at least one test?

    • Options
    • A. 4/15
    • B. 1/15
    • C. 91/25
    • D. 16/125
    • Discuss
    • 9. 
      A coin is successively tossed two times. Find the probability of getting? (1) exactly one head (2)at least one head

    • Options
    • A. 1/2 , 3/4
    • B. 2/3, 1/4
    • C. 1/4, 4/5
    • D. 1/2, 2/3
    • Discuss
    • 10. 
      In a simultaneous throw of two dice find the probability of getting a total of 8 .

    • Options
    • A. 2/9
    • B. 5/36
    • C. 1/6
    • D. Data Inadequate
    • Discuss


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