Question

State whether each of the following statement is true or false. Justify your answer.
(i) {2, 3, 4, 5} and {3, 6} are disjoint sets.
(ii){a, e, i, o, u} and {a, b, c, d} are disjoint sets.
(iii){2, 6, 10, 14} and {3, 7, 11, 15} are disjoint sets.
(iv) {2, 6, 10} and {3, 7, 11} are disjoint sets.

Answer 1

(i) False
As 3 $\in$ {2, 3, 4, 5}, 3 $\in$ {3, 6}
$⇒$ {2, 3, 4, 5} $\cap$ {3, 6} = {3}

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(ii) False
As a $\in$ {a, e, i, o, u}, a $\in$ {a, b, c, d}
$⇒$ {a, e, i, o, u } $\cap$ {a, b, c, d} = {a}

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(iii) True
As {2, 6, 10, 14} $\cap$ {3, 7, 11, 15} = $\phi$

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(iv) True
As {2, 6, 10} $\cap$ {3, 7, 11} = $\phi$