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

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What will be the sum of the first (12) terms of the arithmetic progression (10,18,26,\ldots)?

Answer and explanation

Correct answer: (648)

The twelfth term is (98), so (S_{12}=\frac{12}{2}(10+98)=648). The average of the first and last terms is useful in sums.

Related tags

Ap Sum Twelve Terms Final Check 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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