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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 (a_n=50-2n), find the sum of the first (14) terms.

Answer and explanation

Correct answer: (490)

The first term is (48) and the fourteenth term is (22), so (S_{14}=\frac{14}{2}(48+22)=490). The same sum formula works for a decreasing progression.

Related tags

Nth Term Decreasing Ap Ap Sum 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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