Question Number 126127 by mohammad17 last updated on 17/Dec/20
Commented by mohammad17 last updated on 17/Dec/20
$${help}\:{me}\:{sir} \\ $$
Answered by mahdipoor last updated on 17/Dec/20
$${if}\:\:{P}_{{a}} ^{\:{n}} \Rightarrow{n}\geqslant{a}\:\left(\geqslant\mathrm{0}\right) \\ $$$${P}_{\mathrm{4}} ^{\:{n}} \Rightarrow{n}\geqslant\mathrm{4} \\ $$$${P}_{\mathrm{3}} ^{\:\mathrm{2}−{n}} \Rightarrow\mathrm{2}−{n}\geqslant\mathrm{3}\Rightarrow−\mathrm{1}\geqslant{n}\:\:\:\left({imposiblle}\right) \\ $$