if **Sn** denotes the sum if **n** terms of an A.P whose common difference is is **d** ,show that

d=S_{n}-2S_{n-1}+S_{n-2}

Asked by
Shivam Bapat(D.A.V. PUBLIC SCHOOL) ,
on 4/1/12

if **Sn** denotes the sum if **n** terms of an A.P whose common difference is is **d** ,show that

d=S_{n}-2S_{n-1}+S_{n-2}

Asked by
Shivam Bapat(D.A.V. PUBLIC SCHOOL) ,
on 4/1/12