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[" (v) given "d=5,S(9)=1" ,"],[" (vi) gi...

[" (v) given "d=5,S_(9)=1" ,"],[" (vi) given "a=2,d=8,S_(n)=90," find "n" and "a_(n)],[qquad -210" find "n" and "d" ."]

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