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II-A question 7.27

 
 
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Re: II-A question 7.27
ReynosoDavid - 2018年01月31日 Wednesday 10:11
 
Neighbors are numbers that are consecutive. Examples of subsets that have a pair of neighbors would be $\{1,5,6\}$, and $\{2,3,7\}$. Examples of subsets that do not have a pair of neighbors are $\{1,3,5\}$, and $\{2,4,7\}$.
 
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