Question

Let Dequals​{14​,17​,19​}, Eequals​{14​,16​,17​,18​} and Fequals​{13​,15​,16​,17​,19​}.

Answer 1

Answer:

{14,16,17,18,19}

Step-by-step explanation:

Given the elements in sets,

$D=${$14,17,19$}

$E=${$14,16,17,18$}

$F=${$13,15,16,17,19$}

$D$∪$E$ is asked to be found.

Now it is clear that $F$ is unnecessary for this question.

$D$∪$E$=$D+E-(D$∩$E)$

$D$∪$E$={14,17,19}+{14,16,17,18}-{14,17}

$D$∪$E$={14,16,17,18,19}