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Interval which does not include its endpoints, and is indicated with parentheses is known as

  • A.infinite interval
  • B.closed interval
  • C.integer interval
  • D.open interval

Answer: D

An open interval excludes its endpoints and is written with parentheses:

\[ (a,b) = \{\, x \mid a < x < b \,\} \]

The closed interval \( [a,b] \) uses square brackets and includes both ends.

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