Difference between revisions of "Mock AIME 1 2006-2007 Problems/Problem 11"
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Revision as of 14:45, 24 July 2006
11. Let be the set of strings with only 0's or 1's with length
such that any 3 adjacent place numbers sum to at least 1. For example,
works, but
does not. Find the number of elements in
.