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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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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.
All good now, @sweetshiva9963 ?

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

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