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Math Help - Probability

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    Probability

    Let k greater than or equal to 3 be any given integer. What is the probability that a random k-digit number will have at least one 0, at least one 1, and at least one 2? (Note: as usual, every number starts with either a 1, or a 2, .... or a 9 (but not a 0).).

    Can't figure this out please help!
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