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Omni-MATH / A function f(x,y) is linear in x and in y.f(x,y)=(1)/(xy) for x,y∈{3,4}. What is f(5,5)?

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problem

A function f(x,y)f(x, y) is linear in xx and in y.f(x,y)=1xyy . f(x, y)=\frac{1}{x y} for x,y∈{3,4}x, y \in\{3,4\}. What is f(5,5)f(5,5)?
Plain-text mathematical notation (without MathML)
A function f(x,y) is linear in x and in y.f(x,y)=(1)/(xy) for x,y∈{3,4}. What is f(5,5)?
Original LaTeX notation
A function $f(x, y)$ is linear in $x$ and in $y . f(x, y)=\frac{1}{x y}$ for $x, y \in\{3,4\}$. What is $f(5,5)$?

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