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  • Question
  • In a bag containing three balls, a white ball was placed and then one ball was taken out at random. What is the probability that the extracted ball would turn on to be white, if all possible hypothesis concerning the colour of the balls that initially in the bag were equally possible?


  • Options
  • A. 5/8
  • B. 3/4
  • C. 1/2
  • D. 3/8

  • Correct Answer
  • 5/8 

    Explanation

    Since, all possible hypothesis regarding the colour of the balls are equally likely, therefore these could be 3 white balls, initially in the bag.
    ? Required probability = 1/4 [1 + 3/4 + 1/2 + 1/4]
    = 1/4 [(4 + 3 + 2 + 1)/4] = 5/8


  • More questions

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      The median for the data 2, 4, 6, 8, 10, 12, 14 is

    • Options
    • A. 6
    • B. 8
    • C. 9.5
    • D. 10
    • Discuss
    • 2. 
      The value of 47 / 10000 is?

    • Options
    • A. .0047
    • B. .0470
    • C. .00047
    • D. .000047
    • Discuss
    • 3. If 4x = 18y, then the value of ( x/y - 1) is

    • Options
    • A. 1 3
    • B. 7 2
    • C. 2 3
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    • 4. 
      If the price of 23 toys is Rs. 276, then what will the price (Rs.) of 12 toys?

    • Options
    • A. 144
    • B. 158
    • C. 159
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    • 5. 
      .02 =(......?.....)%

    • Options
    • A. 20
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    • 6. 
      If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

    • Options
    • A. 45
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    • 7. 
      2?63 / 11 =233

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    • A. 4
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    • 8. 
      When 121012 is divided by 12, the remainder is

    • Options
    • A. 0
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    • 9. 
      Aarti can do a piece of work in 6 days. In how many days will she complete three time of work of same type?

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    • 10. 
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    • Options
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