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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 all positive multiples of (7) from (7) to (140).

Answer and explanation

Correct answer: (1470)

The AP is (7,14,\ldots,140) with (20) terms, and its sum is (1470). Finding (n) from the last term is an easy method.

Related tags

Multiples Ap Sum Last Term 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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