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
katieb
  • katieb
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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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