Students in the childrens choir are at least 8 years old but no more than 11 years old

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).

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Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.