Arithmetic progression prove that Question

Er Chandra Bhushan
0

 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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