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Counting theory: Find how many 4-digit positive integers are there with no repeating digits (e.g.: 5823)...

Counting theory: Find how many 4-digit positive integers are there with no repeating digits (e.g.: 5823) or where digit repetition is allowed but all digits must be odd (e.g.: 5531 satisfies this condition but 7726 and 6695 do not since they contain even digits).

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