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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 the first (18) terms of the AP (15,19,23,\ldots).

Answer and explanation

Correct answer: (882)

Putting (a=15), (d=4), (n=18) in the formula gives (S_{18}=882). Always check (d) from the first three terms.

Related tags

Ap Sequence Sum First N Terms 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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