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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 an arithmetic progression has (a=16), (d=6), and (S_n=640), what is the value of (n)?

Answer and explanation

Correct answer: (12)

Using (S_n=\frac{n}{2}[32+6(n-1)]), checking the options shows none match (640). This question should be corrected before import.

Related tags

Ap Sum Find N 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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