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[" 33.Let "S(n)" denote the sum of the f...

[" 33.Let "S_(n)" denote the sum of the first "n],[" terms of an AP.If "S_(2n)=3S_(n)" ,then "],[S_(3n):S_(n)" is equal to "],[[" (1) "4," (2) "6," (3) "8," (4) "10]]

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