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  • Question
  • Two dice and two coins are tossed. The probability that both the coins show head and the sum of the numbers found on the two dice is a prime number is?


  • Options
  • A. 5/72
  • B. 1/12
  • C. 13/144
  • D. 5/48

  • Correct Answer
  • 5/48 

    Explanation

    The probability that head is show in one coin is 1/2.

    The probability that the sum of the number on the dice is a prime = the probability that the following pair of number on the dice is a getting on the dice, namely (1, 1), (1, 2), (2, 1), (1, 4 ), (4, 1), (2, 3), (3, 2), (1, 6), (6, 1), (2, 5), (5, 2), (3, 4), (4, 3), (6, 5), (5, 6) = 15/36.

    ? The required probability = 1/2 x 1/2 x 15/36 = 5/48.


  • More questions

    • 1. 
      Write down the power set of A = {8, 9}.

    • Options
    • A. {?, {8}, {9}, {8, 9}}
    • B. {?, {8}, {9}}
    • C. {?, {8}, {9}, {8, 9}}
    • D. None of these
    • Discuss
    • 2. 
      The area of two similar ?s are 121 cm 2 and 81 cm 2 respectively. What is the ratio of their corresponding heights (altitudes):

    • Options
    • A. 11 9
    • B. 22 9
    • C. 11 18
    • D. 33 6
    • Discuss
    • 3. 
      In how many different ways, can the letters of the word 'VENTURE' be arranged?

    • Options
    • A. 840
    • B. 5040
    • C. 1260
    • D. 2520
    • Discuss
    • 4. 
      Alen and Border can do a work individually in 21 and 42 days respectively. In how many days they can complete the work, working alternatively?


    • Options
    • A. 14
    • B. 28
    • C. 42
    • D. 35
    • Discuss
    • 5. 
      A number is selected at random from the set {1, 2, 3, ........, 50}. The probability that it is a prime, is

    • Options
    • A. 0.1
    • B. 0.2
    • C. 0.3
    • D. 0.3
    • Discuss
    • 6. 
      Sonu can do a piece of work in 20 days. He started the work and left after some days, when 25% work was done. After it Abhijeet joined and completed it working for 10 days. In how many days Sonu and Abhijeet can do the complete work, working together?

    • Options
    • A. 6
    • B. 8
    • C. 10
    • D. 12
    • Discuss
    • 7. 
      19.003 x 22.998 - 280.010

    • Options
    • A. 220
    • B. 110
    • C. 160
    • D. 90
    • Discuss
    • 8. 
      A person buys a book for ? 200 and sells it for ? 225. What will be his gain percent?

    • Options
    • A. 13%
    • B. 14%
    • C. 18.4%
    • D. 12.5%
    • Discuss
    • 9. 
      3, 7, 15, 39, 63, 127, 255, 511?

    • Options
    • A. 7
    • B. 15
    • C. 39
    • D. 63
    • Discuss
    • 10. 
      If A = { x : x = n-1/n+1, n ? W and n ? 10 } ;point out the correct statement from the following:

    • Options
    • A. 0 ? A
    • B. 0 ? A
    • C. 0 ? A
    • D. 1/3 ? A
    • Discuss


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