If A = {1, 2, 4}, B = {2, 4, 5}, C = {2, 5},

Question:

If A = {1, 2, 4}, B = {2, 4, 5}, C = {2, 5}, then (A − B) × (B − C) is

(a) {(1, 2), (1, 5), (2, 5)}

(b) [(1, 4)]

(c) (1, 4)

(d) none of these

Solution:

(b) {(1, 4)}

A = {1, 2, 4}, B = {2, 4, 5} and C = {2, 5}

(A − B) = {1}

(B − C) = {4}

So, (A − B) × (B − C)  = {(1,4)}

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