How many five-digit numbers can be formed using the digits


Question: (a) How many five-digit numbers can be formed using the digits 0-9 inclusive if repetitions are allowed? (Leading O's are not allowed: 07392, for example, should not be considered a five-digit number.)

(b) How many five-digit numbers can be formed if repetition is not allowed?

(c) How many five-digit numbers have one or more repeated digits?

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Mathematics: How many five-digit numbers can be formed using the digits
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