Probability related Questions by Balaji

  • 8August
  • 2014
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    BalajiSenior Member
    Senior Member
    • Posts: 107
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    08-08-2014, 11:40 PM Düzenlendi #4
    consider the 4 digit no abcd what is the probability that sum of the digits is greater than or equal to 4 ?



    a) 899/900



    b) 1/900



    c) 299/300



    d) 599/600





    answer choice d



    solution



    case 1 sum of digits =1



    case 2 sum of digits =2



    case 3 sum of digits  =3



    probability (sum of digits > or equal to 4) = 1-1/600

    =599/600


     
    BalajiSenior Member
    Senior Member
    • Posts: 107
    • Threads: 71
    • Reputation: 43
    08-08-2014, 11:44 PM Düzenlendi #5
    Ram selects 2 two digit no at random and mutiple them what is the chance that the product will end in zero



    a) 1/3



    b) 27/100



    c) 28/81



    d) 29/100





    answer choice b



    solution



    overall probability = (1539+648)/90*90

    =2187/8100

    =27/100




     

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