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Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersExpert

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If (S_n=11781), what is the value of (n)?

Answer and explanation

Correct answer: (153)

(S_{153}=\frac{153\times154}{2}=11781), so (n=153). For large values, using (2S_n) makes identification easier.

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Math Sequences Natural-Numbers Sum Sum Of First N Natural Numbers Sequences And Progressions Mathematics Class 9 Mcq

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