MCQ
In rule method the null set is represented by
  • A
    $\{\}$
  • B
    $\phi $
  • C
    $\{ x:x = x\} $
  • $\{ x:x \ne x\} $

Answer

Correct option: D.
$\{ x:x \ne x\} $
d
(d) It is fundamental concept.

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