The number of different four digit numbers that can be formed with the digits 2,3,4,7 and using each digit only is

Using the digits 2, 4, 5 and 3 once, write the smallest four digit decimal number. - Mathematics | Shaalaa.com

How many four-digit numbers can be formed using only the digits 1, 2, 3, 4, 5, 6, 7, 8, 9? How many four-digit numbers can be formed using only the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 where no digits are repeated?

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