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Omni-MATH / 40 cells were marked on an infinite chessboard. Is it always possible to find a rectangle that contains 20 marked cells? M. Evdokimov

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4040 cells were marked on an infinite chessboard. Is it always possible to find a rectangle that contains 2020 marked cells? M. Evdokimov
Plain-text mathematical notation (without MathML)
40 cells were marked on an infinite chessboard. Is it always possible to find a rectangle that contains 20 marked cells?

M. Evdokimov
Original LaTeX notation
$40$ cells were marked on an infinite chessboard. Is it always possible to find a rectangle that contains $20$ marked cells?

M. Evdokimov

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