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If (S_{52}=1378), what will be the value of (S_{54})?

Answer and explanation

Correct answer: 1485

Here, \(S_n\) denotes the sum of the first \(n\) natural numbers. To move from \(S_{52}\) to \(S_{54}\), add the next two numbers, 53 and 54: \(S_{54}=S_{52}+53+54=1378+107=1485\). Therefore, 1485 is correct. Option 1495 would require an increase of 117, whereas the required increase is \(53+54=107\). Exam tip: In questions involving nearby values of \(S_n\), adding the new terms is often quicker than applying the full formula.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of Natural NumbersSeriesSum Of First N Natural NumbersClass 9 Mcq

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