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How many four-digit numbers can be formed from the digits 1, 3, 5, 7, 8, and...

How many four-digit numbers can be formed from the digits 1, 3, 5, 7, 8, and 9 if the numbers are less than 3,000 and digits are not used repeatedly? ( Hint: Begin with the digit where there is a restriction on the choices.)
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