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Re: If x, y and z are non-negative integers such that x < y < z, [#permalink]
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Sirish123 wrote:
is there a more quicker version to solve this question? i dont think we will have much time during the actual Exam to list out all the numbers?

There are situations in which counting all of the possible outcomes is actually the fastest approach.
Be sure to include the strategy in your mathematical toolbox.
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