Question Number 151401 by Rankut last updated on 20/Aug/21
Commented by Rankut last updated on 20/Aug/21
$${please}\:{i}\:{need}\:{your}\:{help} \\ $$
Answered by mr W last updated on 03/Sep/21
$$\left({a}\right) \\ $$$${C}_{\mathrm{3}} ^{\mathrm{15}} =\mathrm{455} \\ $$$$\left({b}\right) \\ $$$${C}_{\mathrm{2}} ^{\mathrm{14}} =\mathrm{91} \\ $$$$\left({c}\right) \\ $$$${C}_{\mathrm{3}} ^{\mathrm{14}} =\mathrm{364} \\ $$