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The symbols below come in matched pairs. Supply the one that closes the pair now open.
(, ), [, ], {, ?

  • A.}
  • B.)
  • C.]
  • D.<

Answer: D

Correct answer: }

The series steps through the bracket pairs in the order they appear on the keyboard, giving each opening bracket followed by its closing partner: round, then square, then curly. The curly pair has been opened but not closed, so the next symbol is }. Recognising that the terms come in pairs is the whole of the problem; the individual symbols carry no arithmetic. There are only three bracket pairs in common use, so a series of this kind can run for at most six terms before it must repeat or stop.

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