Prove that d=Sn-2Sn-1-Sn-2
Soln:-d=Sn-2Sn-1-Sn-2
We know that, d=an-an-1
d=Sn-Sn-1-Sn-1-Sn-2
d=Sn-2Sn-1-Sn-2
Proved
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