If Sn be the sum of n terms of an A.P the value of Sn minus 2sn-1 plus Sn-2 is
1)d
2)d square
3)cannot be calculated
4)None of these
Thanks in advance
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Arithmetic and geometric progression
Replies (1)
sn - 2sn-1+sn-2
= -3 that is calculatedtherefore,answer is 4).none .
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