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Class 9MathematicsSequences and ProgressionsSum of first n natural numbersMediumLevel 60
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If the sum of the first (n) natural numbers is (406), what is the value of (n)?

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Answer and explanation

Correct answer: (28)

(S_{28}=\frac{28\times29}{2}=406), so (n=28). You can quickly check by substituting the options in the formula.

Related tags

MathSequencesNatural-NumbersSum

Frequently asked questions

What is the correct answer to this question?

(28)

Why is this the correct answer?

(S_{28}=\frac{28\times29}{2}=406), so (n=28). You can quickly check by substituting the options in the formula.

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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