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[" 75.A non constant arithmatic progress...

[" 75.A non constant arithmatic progression has common difference d and first term is "(1-oo)],[" sum of the first "20" terms is "20," then the value of a is equal to: "],[[" (a) "(2)/(19)," (b) "(19)/(2)," (c) "(2)/(0)," (d) "(9)/(2)]]

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