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A set A contains 10 elements. Set B is s...

A set A contains 10 elements. Set B is subset of A and sec C is also subset of A. B and C are such that `CuuB=A` amd `CnnB=varphi` . Then number of possible ordered pairs of set B and C is `2^9` (2) `2^8` (3) `3^(10)` (4) `2^(10)`

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