Consider the following parameters of a relation r (A, B, C) in which A be the primary key. nr = 20000 V (B, r) = 120 max (C, r) = 500 min (C, r) = 0 Estimate the size of the following selection operations. a)σ A = k (r) b)σ A = k1 ∨ B = k2 (r) c)σ C >= Z ∧ C <= 105 (r)

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