sweetshiva9963
  • sweetshiva9963
How many strings of three decimal digits (0, 1, 2, …, 9) a) do not contain the same digit three times? b) begin with an odd digit?
Discrete Math
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Consider that there are 10 x 10 x 10 total strings of 3-digit numbers (if you allow leading 0's) There are only 10 where all digits are the same (all 0's through all 9's) So, you have: 10 x 10 x 10 - 10 strings where you don't have 3 identical digits. As for your second question, there are: 5 x 10 x 10 that start with an odd digit which happens to be the same as the number that start with an even digit.
anonymous
  • anonymous
All good now, @sweetshiva9963 ?
sweetshiva9963
  • sweetshiva9963
Yea

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anonymous
  • anonymous
Ok! Glad I was able to help you! @sweetshiva9963
anonymous
  • anonymous
Good luck to you in all of your studies and thx for the recognition! @sweetshiva9963
sweetshiva9963
  • sweetshiva9963
your welcome. Thanks for the help
anonymous
  • anonymous
anytime!

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