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

 Mar 22, 2019

Best Answer 

 #1
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\(\text{the first number must be odd}\\ 4 \cdot 3 \cdot 3 \cdot 2 \cdot 2 = 144\\\)

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 Mar 22, 2019
 #1
avatar+5172 
+2
Best Answer

\(\text{the first number must be odd}\\ 4 \cdot 3 \cdot 3 \cdot 2 \cdot 2 = 144\\\)

Rom Mar 22, 2019

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