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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, (S_{15}=495) and (S_{30}=1890). Find the value of (S_{45}).

Answer and explanation

Correct answer: (4185)

The given sums give (a=5) and (d=4), so (S_{45}=4185). First determine the AP from the two partial sums.

Related tags

Two Sums Find Later Sum 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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