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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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Find the sum of the first (15) terms of the arithmetic progression (7,20,33,\ldots).

Answer and explanation

Correct answer: (1470)

The fifteenth term is (189), so (S_{15}=\frac{15}{2}(7+189)=1470). With a large difference, finding the last term is important.

Related tags

Ap Sum Large Difference Medium 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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