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Which number should be added to (S_{44}) to get (S_{50})?

Answer and explanation

Correct answer: \(285\)

Here, \(S_n\) denotes the sum of the first \(n\) natural numbers. Therefore, \(S_{50}-S_{44}\) contains only the terms from 45 to 50: \(45+46+47+48+49+50=285\). Hence, adding \(285\) to \(S_{44}\) gives \(S_{50}\). An option such as \(279\) is incorrect because it is not the complete sum of these six consecutive terms. Exam tip: To find \(S_b-S_a\), add the terms from \(a+1\) to \(b\).

Related tags

Sequences And ProgressionsSum Of Natural NumbersSeriesSum NotationClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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