If the ( n^{th} ) term of a series is a quadratic polynomial ( u_n = an^2 + bn + c ), then the sum to ( n ) terms is obtained by applying the standard formulae for ( \sum n^2 ), ( \sum n ) and ( \sum 1 ).
If the ( n^{th} ) term of a series is a quadratic polynomial ( u_n = an^2 + bn + c ), then the sum to ( n ) terms is obtained by applying the standard formulae for ( \sum n^2 ), ( \sum n ) and ( \sum 1 ).
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