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If A and B are any two sets, then A – B is equal to ______________.

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When A = ϕ, then number of elements in P(A) is _________.

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If A and B are finite sets such that A ⊂ B, then n (A ∪ B) = ______________.

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Power set of the set A = {1, 2} is ______________.

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Given the sets A = {1, 3, 5}. B = {2, 4, 6} and C = {0, 2, 4, 6, 8}. Then the universal set of all the three sets A, B and C can be ______________.