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

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Find the value of (S_{81}+S_{108}-S_{54}).

Answer and explanation

Correct answer: (7722)

(S_{81}=3321), (S_{108}=5886), and (S_{54}=1485), so the value is (7722). 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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