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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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If an arithmetic progression has first term (14), common difference (6), and (20) terms, what is the sum?

Answer and explanation

Correct answer: (1420)

The twentieth term is (128), so (S_{20}=\frac{20}{2}(14+128)=1420). Keep both the last term and the number of terms correct.

Related tags

Ap Sum Common Difference 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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