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Omni-MATH / Find the number of 20-tuples of integers x₁,…,x₁₀,y₁,…,y₁₀ with the following properties: - 1≤x_(i)≤10 and 1≤y_(i)≤10 for each i; - x_(i)≤x_(i+1) for i=1,…,9; - if x_(i)=x_(i+1), t…

Problem

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problem

Find the number of 20-tuples of integers x1,…,x10,y1,…,y10x_{1}, \ldots, x_{10}, y_{1}, \ldots, y_{10} with the following properties: - 1≤xi≤101 \leq x_{i} \leq 10 and 1≤yi≤101 \leq y_{i} \leq 10 for each ii; - xi≤xi+1x_{i} \leq x_{i+1} for i=1,…,9i=1, \ldots, 9; - if xi=xi+1x_{i}=x_{i+1}, then yi≤yi+1y_{i} \leq y_{i+1}.
Plain-text mathematical notation (without MathML)
Find the number of 20-tuples of integers x₁,…,x₁₀,y₁,…,y₁₀ with the following properties: - 1≤x_(i)≤10 and 1≤y_(i)≤10 for each i; - x_(i)≤x_(i+1) for i=1,…,9; - if x_(i)=x_(i+1), then y_(i)≤y_(i+1).
Original LaTeX notation
Find the number of 20-tuples of integers $x_{1}, \ldots, x_{10}, y_{1}, \ldots, y_{10}$ with the following properties: - $1 \leq x_{i} \leq 10$ and $1 \leq y_{i} \leq 10$ for each $i$; - $x_{i} \leq x_{i+1}$ for $i=1, \ldots, 9$; - if $x_{i}=x_{i+1}$, then $y_{i} \leq y_{i+1}$.

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