Question Number 113604 by mohammad17 last updated on 14/Sep/20
$${if}\:{A}=\left\{\mathrm{1},\mathrm{2}\right\}\:{and}\:{let}\:{R}=\left\{\left({a},{b}\right)\in{A}×{A}:{a}=\mathrm{3}{b}\right\}\: \\ $$$${then}\:{R}=\:? \\ $$$$ \\ $$$${help}\:{me}\:{sir} \\ $$