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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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In an AP, (a=2), and (S_{15}=6S_5). What is the common difference (d)?

Answer and explanation

Correct answer: (\frac{2}{3})

Putting (a=2) in (S_{15}=6S_5) gives (d=\frac{2}{3}). In ratio questions, apply the sum formula on both sides.

Related tags

Ratio Of Sums Common Difference Ap 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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