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JEE Advanced2010MathematicsSets and RelationsActual

Let S= 1,2,3,4 . The total number of unordered pairs of disjoint subsets of S is equal to

Options

  1. A25
  2. B34
  3. C42
  4. D41

Correct answer

D. 41

Step-by-step solution

Let A B= , A, B S aligned & 3^4= 81+1 2 =41 & 3^4+1 2 =41 aligned

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