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AMC 12 2019b Problem 23

  • Paper

How many sequences of 00s and 11s of length 1919 are there that begin with a 00, end with a 00, contain no two consecutive 00s, and contain no three consecutive 11s?

(A) 55(B) 60(C) 65(D) 70(E) 75\textbf{(A) }55 \textbf{(B) }60 \textbf{(C) }65 \textbf{(D) }70 \textbf{(E) }75

Dataset text AMC 12 2000 to 2025. Quoted with source.

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C

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