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Class 10 Mathematics Arithmetic Progressions (AP)Finding the sum of the first (n) terms of an APMedium

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What is the sum of the first (22) terms of the arithmetic progression (3,11,19,\ldots)?

Answer and explanation

Correct answer: (1914)

The twenty-second term is (171), so (S_{22}=\frac{22}{2}(3+171)=1914). The average of the first and last terms is useful.

Related tags

Ap Sum Twenty Two Terms Average Finding The Sum Of The First (N) Terms Of An Ap Finding The Sum Of The First N Terms Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap Mathematics

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