Math

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What is the theoretical probability of a computer choosing a 2 digit number between 1 and 100 whose ones digit is greater than the tens digit?

  • Math -

    lead digit
    9, then 8 numbers, e.g. 98 97 96 95 94 93 92 91
    8, then 7 numbers
    ...
    2 , then 1 number
    number of cases = 9+8+7+6+5+4+3+2+1 = 45

    so prob = 45/99 = 5/11

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