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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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If in an AP (S_6=81) and (S_{12}=342), what is the value of (S_{24})?

Answer and explanation

Correct answer: (1404)

The given sums give (a=1) and (d=5), so (S_{24}=1404). First determine the AP from the smaller sums.

Related tags

Two Sums Find S24 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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