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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 (S_5=30) and (S_{12}=408), what will be the sum of the (6)th to (12)th terms?

Answer and explanation

Correct answer: (378)

The sum of the (6)th to (12)th terms is (S_{12}-S_5=378). The sum of middle terms is found from the difference of partial sums.

Related tags

Partial Sum Ap Sum 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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