Answer :

(i) Let us assume, A = {2, 3, 4, 5}

And, B = {3, 6}

∴

= {3}

Hence, A and B are not disjoint sets

∴ The given statement is false

(ii) Let us assume, A = {a, e, i, o, u}

And, B = {a, b, c, d}

∴

= {a}

Hence, A and B are not disjoint sets

∴ The given statement is false

(iii) Let us assume, A = {2, 6, 10, 14}

And, B = {3, 7, 11, 15}

∴

Hence, A and B are disjoint sets

∴ The given statement is true

(iv) Let us assume, A = {2, 6, 10}

And, B = {3, 7, 11}

∴

Hence, A and B are disjoint sets

∴ The given statement is true

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