Discrete Maths - Sets

1. Let R be a non-empty relation on a collection of sets defined by ARB if and only if A  ∩ B = Ø
Then (pick the TRUE statement) 

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2. The binary relation S = Φ (empty set) on set A = {1, 2,3} is

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3. Which of the following sets are null sets ?

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4. Number of subsets of a set of order three is

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5. "n/m" means that n is a factor of m, then the relation T is

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