X o ( Y o Z ) = ( X o Y ) o Z
77. If relation R is defined on N by R = ((a, b): a divides b; a, b ∈ N). Then R is
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79. If P, Q, R are subsets of a set A, then R x (Pc ∪Qc)c = (R x P) ∩(R x Q)
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80. Relation R defined on the set A = {1, 2, 3, 4}, by R = {(1, 1), (2, 2) (3, 3)} is
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