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Subjects
Class 9MathematicsSequences and ProgressionsSum of first n natural numbersExpertLevel 60
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What is the ratio of the sums of the first (120) and first (80) natural numbers?

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Answer and explanation

Correct answer: (121:81)

(S_{120}:S_{80}=7260:3240=121:54), so the listed options do not contain the correct simplified ratio. Simplify fully.

Related tags

SequencesProgressionsNatural-NumbersRatio

Frequently asked questions

What is the correct answer to this question?

(121:81)

Why is this the correct answer?

(S_{120}:S_{80}=7260:3240=121:54), so the listed options do not contain the correct simplified ratio. Simplify fully.

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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