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How many arrangements of the numbers  1,2,3,...,7 are there where the sum of any two adjacent numbers is odd?

 Mar 19, 2020
 #1
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We   have

 

odd  even  odd even odd even  odd  =  4 * 3 * 3 * 2 * 2 * 1 * 1 =  144

 

 

cool cool cool

 Mar 19, 2020

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