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AMC 12 2019b Problem 16

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There are lily pads in a row numbered 00 to 1111, in that order. There are predators on lily pads 33 and 66, and a morsel of food on lily pad 1010. Fiona the frog starts on pad 00, and from any given lily pad, has a 12\frac{1}{2} chance to hop to the next pad, and an equal chance to jump 22 pads. What is the probability that Fiona reaches pad 1010 without landing on either pad 33 or pad 66?

(A) 15256(B) 116(C) 15128(D) 18(E) 14\textbf{(A) } \frac{15}{256} \textbf{(B) } \frac{1}{16} \textbf{(C) } \frac{15}{128} \textbf{(D) } \frac{1}{8} \textbf{(E) } \frac14

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

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