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[" Directions (Q.Nos."73-74)" Let "S(n)"...

[" Directions (Q.Nos."73-74)" Let "S_(n)" denotes the sum of "],[" first "n" terms of an "AP" and "3S_(n)=S_(2n)" ."],[" 73.What is "S_(3n):S_(n)" equal to? "],[[" (a) "4:1," (b) "6:1],[" 74.What is "S_(3n):S_(2n)" equal to? "],[[" (a) "2:1," (b) "3:1," (c) "4:1," (d) "5:1]]]

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