PUMaC 2024 · 组合（B 组） · 第 1 题

PUMaC 2024 — Combinatorics (Division B) — Problem 1

Sunay is in the bottom-left square of a checkerboard which is 5 squares wide (the left-right direction) and 3 squares tall (the up-down direction). From any square, he may move one square up, one square down, or one square to the right, provided that he does not fall off the checkerboard and provided that he does not revisit a square. How many paths are there for Sunay from the bottom-left square to the top-right square?

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