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

If (S_n=231), what will be (S_{n+4})?

Answer and explanation

Correct answer: (351)

(231=S_{21}), so (S_{25}=\frac{25\cdot26}{2}=325). Identify the given (n) and move (4) ahead.

Tags

sequencesprogressionsnatural-numbersnext-sum

Frequently asked questions

What is the correct answer to this question?

(351)

Why is this the correct answer?

(231=S_{21}), so (S_{25}=\frac{25\cdot26}{2}=325). Identify the given (n) and move (4) ahead.

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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