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Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersExpertLevel 61

If (S_n=31375), what is the value of (S_{n-12})?

Answer and explanation

Correct answer: (28441)

(31375=S_{250}), so (S_{238}=\frac{238\cdot239}{2}=28441). Identify (n) first and reduce it by (12).

Tags

sequencesprogressionsnatural-numbersprevious-sum

Frequently asked questions

What is the correct answer to this question?

(28441)

Why is this the correct answer?

(31375=S_{250}), so (S_{238}=\frac{238\cdot239}{2}=28441). Identify (n) first and reduce it by (12).

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.

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