Discussion
Three kinds of bracket appear here in a fixed order. Which symbol belongs at the question mark?
<, >, {, }, [, ?
Answer: A
Correct answer: ]
The symbols come in matched pairs: angle brackets, then curly braces, then square brackets. Each opening symbol is followed immediately by its closing partner, and the square bracket has been opened, so the next is ]. The order of the pairs follows their arrangement on the keyboard rather than any convention of mathematics. The order of the pairs follows the keyboard from the comma and full stop keys leftward to the square brackets, not any mathematical convention.
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