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[" If the sum of the first "11" terms of...

[" If the sum of the first "11" terms of an arithmetical progression equals that of the first "19" terms,then the "],[" sum of its first "30" terms,is "],[[" (A) equal to "0," (B) equal to "-1," (C) equal to "1," (D) non unigue "]]

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If the sum of the first 11 terms of an arithmetical progression equals that of the first 19 terms,then the sum of its first 30 terms,is (A) equal to 0 (B) equal to -1 (C) equal to 1 (D) non unique

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