Question: How many 5-digit numbers can be formed using the numbers 0-9 when repetition is allowed? How many 5-digit numbers can be formed using the numbers

How many 5-digit numbers can be formed using the numbers 0-9 when repetition is allowed?

How many 5-digit numbers can be formed using the numbers 0-9 when repetition is not allowed?

How many 5-digit numbers can be formed using the numbers 0-9 when the first digit must not be 9 and repetition is not allowed?

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