The number of 5-digit numbers that contain only digits 1,2,3,4,5, and uses each digit exactly once is; 14253
Note: The digits 1 and 2 cannot be neighbors and digits 3 and 4 cannot be neighbors.
Find the number of 5 digits numbers that is possible using; 1, 2, 3, 4, and 5 as digits. Each digit is supposed to be used just once.
Order of the numbers will really matter. This is because, 3 and 4 cannot be nearby each other. Same case with 1 and 2, they cannot be neighbors.
The number 14253, is a correct number.
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