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forum.virtualchallengemeets.com • View topic - AMC 12 Problem 25 2007

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AMC 12 Problem 25 2007

American Mathematics Contest & American Invitational Mathematics Examination. See for more information
Note:USAMO/IMO-level questions need to go in the Olympiad section.
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AMC 12 Problem 25 2007

Postby zefuri » Fri Apr 20, 2007 12:34 pm

Call a set of integers spacy if it contains no more than one out of any three consecutive integers. How many subsets of [unparseable or potentially dangerous latex formula] including the empty set, are spacy?

(A)121
(B)123
(C)125
(D)127
(E)129
zefuri
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