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Closed interval is denoted by

  • A.(a,b)
  • B.[a,b)
  • C.(a,b]
  • D.[a,b]

Answer: D

Square brackets include the endpoint; round brackets exclude it.

\[ [a,b] = \{\, x \mid a \leq x \leq b \,\} \]

So \( [a,b] \) is the closed interval. \( (a,b) \) is open, and the two mixed forms are half-open.

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