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Omni-MATH / How many ways can one color the squares of a 6×6 grid red and blue such that the number of red squares in each row and column is exactly 2?

Problem

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problem

How many ways can one color the squares of a 6×66 \times 6 grid red and blue such that the number of red squares in each row and column is exactly 2?
Plain-text mathematical notation (without MathML)
How many ways can one color the squares of a 6×6 grid red and blue such that the number of red squares in each row and column is exactly 2?
Original LaTeX notation
How many ways can one color the squares of a $6 \times 6$ grid red and blue such that the number of red squares in each row and column is exactly 2?

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