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

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Find the value of (S_{64}+S_{84}-S_{74}).

Answer and explanation

Correct answer: (2875)

(S_{64}=2080), (S_{84}=3570), and (S_{74}=2775), so the value is (2875). In mixed sums, write each (S_n) separately.

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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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