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

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If (S_n=16290), what is the value of (S_{n-8})?

Answer and explanation

Correct answer: (14878)

(16290=S_{180}), so (S_{172}=\frac{172\cdot173}{2}=14878). Identify (n) first and then reduce it by (8).

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

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