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Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Convert 2000 swiss francs to dutch guilders

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).