Math

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How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit?

Please help :)
thanks
-Zach

  • Math -

    9a

  • Math (need help) -

    Let a = hundreds, b = tens, c = ones

    a ≤ b ≤ c

    Examples of what you are seeking are:

    111
    112
    113...

    122
    123
    124...

    133
    134
    135...

    222
    223
    224...

    ...999

    Unfortunately, I cannot think of an equation to help you solve this problem. Sorry.

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