Question Number 102269 by mohammad17 last updated on 07/Jul/20

if P_2 ^( n−m) =72 and P_2 ^( n+m) =210 find the value of m and n ?

Answered by Dwaipayan Shikari last updated on 07/Jul/20

(((n−m)!)/((n−m−2)!))=72 (n−m)(n−m−1)=72 a(a−1)=72 {take n−m as a a=9 so n−m=9 (((n+m)!)/((n+m−2)!))=210 (n+m)(n+m−1)=210 p(p−1)=210 { take n+m as p p=15 so n+m=15 so { ((n=12)),((m=3)) :}

Commented bymohammad17 last updated on 08/Jul/20

thank you