What is the probability that a 6 digit number selected at random contains at most three digits repeated?
I'm new to probability, and try as I might, I cannot solve this. Any help will be appreciated.
P.S. first digit cannot be zero
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1$\begingroup$ Is it even possible that a 6 digits number contains four repeated digits? $\endgroup$– ajotatxeDec 9, 2018 at 18:01
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$\begingroup$ Is the first digit allowed to be zero? $\endgroup$– Michael BehrendDec 9, 2018 at 18:29
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$\begingroup$ @MichaelBehrend no $\endgroup$– Arka SethDec 9, 2018 at 18:31
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$\begingroup$ @ajotatxe 999999 $\endgroup$– Arka SethDec 9, 2018 at 18:32
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1$\begingroup$ @ajotatxe the question is framed exactly like this in my book, but the author meant to say that a single digit is repeated n number of times. $\endgroup$– Arka SethDec 9, 2018 at 19:08
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