174. let n be a positive integer and define f(n)= 1!+2!+3!+.+n !. find polynomials plx) and qcx) such that f (n + 2) = q(n) s (n)+ pn) s (n + 1) for all n 21.

174. Let n be a positive integer and define f(n)= 1!+2!+3!+.+n !. Find polynomials Plx) and QCx) such that f (n + 2) = Q(n) S (n)+ Pn) s (n + 1) for all n 21.