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Omni-MATH / How many ordered pairs (S,T) of subsets of {1,2,3,4,5,6,7,8,9,10} are there whose union contains exactly three elements?

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problem

How many ordered pairs (S,T)(S, T) of subsets of {1,2,3,4,5,6,7,8,9,10}\{1,2,3,4,5,6,7,8,9,10\} are there whose union contains exactly three elements?
Plain-text mathematical notation (without MathML)
How many ordered pairs (S,T) of subsets of {1,2,3,4,5,6,7,8,9,10} are there whose union contains exactly three elements?
Original LaTeX notation
How many ordered pairs $(S, T)$ of subsets of $\{1,2,3,4,5,6,7,8,9,10\}$ are there whose union contains exactly three elements?

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