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

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If (S_n=15400), what is the value of (S_{n-10})?

Answer and explanation

Correct answer: (13545)

(15400=S_{175}), so (S_{165}=\frac{165\cdot166}{2}=13695). The listed options do not contain the correct value.

Related tags

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

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