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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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What is the sum of the first (19) terms of the AP (11,17,23,\ldots)?

Answer and explanation

Correct answer: (1235)

Putting (a=11), (d=6), (n=19) in the formula gives (S_{19}=1235). Do not worry about (\frac{n}{2}) when (n) is odd.

Related tags

Odd Number Of Terms 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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