Question Number 114660 by mohammad17 last updated on 20/Sep/20
Commented by mohammad17 last updated on 20/Sep/20
$${help}\:{me}\:{sir} \\ $$
Answered by bobhans last updated on 20/Sep/20
$$\frac{\mathrm{9}!}{\mathrm{4}!.\mathrm{2}!}\:=\:\frac{\mathrm{9}.\mathrm{8}.\mathrm{7}.\mathrm{6}.\mathrm{5}}{\mathrm{2}}\:=\:\mathrm{36}×\mathrm{210}=\mathrm{7560} \\ $$