Call a set of integers spacy if it contains no more than one out of any three consecutive integers. How many subsets of {1,2,3,4,.....,12} are spacy?

Could someone please take a look at my attached work

Vicky.

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- Jul 17th 2010, 09:10 AMVicky1997Spacy sets
Call a set of integers spacy if it contains no more than one out of any three consecutive integers. How many subsets of {1,2,3,4,.....,12} are spacy?

Could someone please take a look at my attached work

Vicky. - Jul 17th 2010, 09:29 AMtonio
- Jul 17th 2010, 11:39 AMVicky1997
Thank you!!!!!!