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

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Find the sum of the first (18) terms of the AP (80,75,70,\ldots).

Answer and explanation

Correct answer: (675)

Here (a=80), (d=-5), (n=18), and the sum is (675). Do not forget the negative sign of (d) in a decreasing AP.

Related tags

Negative Common Difference 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 Class 10 Mcq

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