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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 (S_9=225) and (S_{18}=855), what is the sum of the (10)th to (18)th terms?

Answer and explanation

Correct answer: (630)

The sum of the (10)th to (18)th terms is (S_{18}-S_9=630). For a group of consecutive terms, take the difference of partial sums.

Related tags

Partial Sum Ap Sum Consecutive Terms 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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