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Half closed interval is also known as

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

Answer: C

An interval containing one endpoint but not the other is called half open - equivalently half closed, since it is open at one end and closed at the other.

\[ [a,b) \quad\text{and}\quad (a,b] \]

The two names describe the same thing from opposite viewpoints.

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