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Which among the following is not notated as infinite language ?

  • A.Palindrome
  • B.Reverse
  • C.Factorial
  • D.L={ab}*

Answer: C

The one not notated as an infinite language is Factorial.

The set of palindromes over an alphabet, the set of strings formed by a word followed by its reverse, and L = {ab}*, which contains the empty string, ab, abab and so on, are all standard examples of infinite languages: each contains infinitely many strings.

'Factorial' names a function on numbers, not a set of strings, so it is the one that is not written as an infinite language.

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