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If ABCD be any random 4-digit number in base 11, what is the probability that A < B < C < D?

How i can achieve this? Thanks in advance.

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    Depends. We allowing leading zeros?2012-05-07
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    No..It must be a 4 digit.No leading zeros.2012-05-07
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    This changes the problem then.2012-05-07

1 Answers 1