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

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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.

Related tags

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

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