Let S={1,2,3,4}. The total number of unordered pair of diŝjoint subsets of S is equal to [IIT-JEE...

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Let S={1,2,3,4}. The total number of unordered pair of diŝjoint subsets of S is equal to
[IIT-JEE 2010, 5M]
(a) 25
(b) 34
(c) 42

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