Prove that d=Sn-KS(n-1)+S(n-2) where n denotes no. ofvterms and S denotes sum of terms

Prove that d=Sn-KS(n-1)+S(n-2) where n denotes no. ofvterms and S deno

1.	Prove that d=Sn-KS(n-1)+S(n-2) where n denotes no. ofvterms and S denotes sum of terms
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