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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/math-for-fun-and-glory/puzzles/brain-teasers/v/3-d-path-counting-brain-teaser

Extending the path counting to three dimensions. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/math/math-for-fun-and-glory/amc-10/2013-amc-10-a/v/2013-amc-10-a-21-amc-12-a-17?utm_source=YT&utm_medium=Desc&utm_campaign=mathforfunandglory

Missed the previous lesson? https://www.khanacademy.org/math/math-for-fun-and-glory/puzzles/brain-teasers/v/path-counting-brain-teaser?utm_source=YT&utm_medium=Desc&utm_campaign=mathforfunandglory

Math For Fun and Glory on Khan Academy: Strengthen your brain with some mind bending riddles and puzzles.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

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