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Help plz with counting

 

Find the number of ways of arranging the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 in a row so that the product of any two adjacent numbers is even or a mutliple of 3

 Apr 6, 2023
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10!  - (9! *6)  +  (8! * 6) =1,693,440 - number of ways of arranging them.

 Apr 7, 2023

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