Sn denotes the sum of n terms of an ap whose commmon difference is d and first term is a .find sn -2sn-1+sn-2
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Sn denotes the sum of n terms of an ap whose commmon difference is d and first term is a .find sn -2sn-1+sn-2
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= 2sn-2sn-1-2
= -3
I think it is the answer