1.

Suppose the sum of the first m terms of an arithemetic progression is n and the sum of its first n terms is m, where m≠n. Then the sum of the first (m+n) terms of the arithemetic progression is

Answer»

Suppose the sum of the first m terms of an arithemetic progression is n and the sum of its first n terms is m, where mn. Then the sum of the first (m+n) terms of the arithemetic progression is



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