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

 Jun 4, 2023
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1, 3, 5, 7, 9 ==5!

2, 4, 6, 8    ==4!

 

Total number of arrangements==5! x 4! ==120  x  24 ==2,880 such permutations.

 Jun 5, 2023

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