HMMT 2021 C9
- Combinatorics
- Answer
An up-right path between two lattice points and is a path from to that takes steps of length 1 unit either up or to the right.
How many up-right paths from to , when drawn in the plane with the line , enclose exactly one bounded region below that line?
Dataset text NuminaMath olympiads. Quoted with source.
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637
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