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how many 2 digit numbers can be written so that the second digit is greater than the digit before it ?

  • math -

    12 through 19 = 8.
    23 through 29 = 7.
    34 through 39 = 6.
    45 through 49 = 5.
    56 through 59 = 4.
    67 through 69 = 3.
    78 through 79 = 2.
    89-------- = 1.

    Total----- = 36 Numbers.

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