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

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If (S_u=1225) and (S_v=2628), what is the value of (u+v)?

Answer and explanation

Correct answer: (121)

(S_{49}=1225) and (S_{72}=2628), so (u+v=121). First identify the indices of both triangular numbers.

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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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