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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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What is the sum of the first (30) terms of the AP (-5,-2,1,\ldots)?

Answer and explanation

Correct answer: (1155)

Here (a=-5), (d=3), (n=30), so the sum is (1155). The same formula works even with a negative first term.

Related tags

Negative First Term Ap Sum 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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