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(vi) given - Lu"Wii) given a = 8,0 = 62, S = 210, find n and d.14 find n and a

Answer»

Sn=n/2(a+a+(n-1)d)an=a+(n-1)dhence210=n/2(8+62)n=420/70n=662=8+5*d54=5*dd=54/5



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