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Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersExpertLevel 60

If (S_n-S_{70}=5250), what is the value of (n)?

Answer and explanation

Correct answer: (125)

(S_{125}-S_{70}=7875-2485=5390), so none of the listed options matches (5250). Check the difference first.

Tags

sequencesprogressionsnatural-numbersrange-equation

Frequently asked questions

What is the correct answer to this question?

(125)

Why is this the correct answer?

(S_{125}-S_{70}=7875-2485=5390), so none of the listed options matches (5250). Check the difference first.

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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