Question Number 199624 by pascal889 last updated on 06/Nov/23
Commented by mr W last updated on 06/Nov/23
$${you}\:{have}\:{posted}\:{the}\:{same}\:{question} \\ $$$${one}\:{time}\:{and}\:{a}\:{comment}\:{was}\:{given}. \\ $$$${why}\:{don}'{t}\:{you}\:{check}\:{if}\:{your}\:{question} \\ $$$${is}\:{wrong}?\:{maybe}\:{the}\:{question}\:{is} \\ $$$${show}\:{that}\:\left(\mathrm{B}\cap\mathrm{C}\right)'=\mathrm{B}'\cup\mathrm{C}'. \\ $$