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What is obtained by adding (46), (47), and (48) to the sum of the first (45) natural numbers?

Answer and explanation

Correct answer: \(S_{48}\)

If \(S_{45}=1+2+\cdots+45\), then adding \(46\), \(47\), and \(48\) gives \(1+2+\cdots+45+46+47+48=S_{48}\). \(S_{47}\) would include terms only up to 47; adding 48 makes the result \(S_{48}\). Exam tip: when consecutive next natural numbers are added, the subscript of the sum becomes the last number added.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSeries NotationSum Of N Natural NumbersSum Of First N Natural NumbersClass 9 Mcq

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