3. How many integers between 1000 and 10,000 are there with (make sure to avoid sequences of digits with leading O's): (
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3. How many integers between 1000 and 10,000 are there with (make sure to avoid sequences of digits with leading O's): (
3. How many integers between 1000 and 10,000 are there with (make sure to avoid sequences of digits with leading O's): (a) Distinct digits? (b) Repetition of digits allowed but with no 2 or 4? (c) Distinct digits and at least one of 2 and 4 must appear?