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How much less is the sum of the first (99) natural numbers than the sum of the first (100) natural numbers?

Answer and explanation

Correct answer: 100

The sum of the first 100 natural numbers contains exactly one additional term beyond the sum of the first 99 natural numbers: 100. Therefore, \(S_{100}-S_{99}=100\). Option 99 is the last number among the first 99 natural numbers, not the difference between the two sums. Exam tip: The difference between sums of consecutive natural-number terms is always the next natural number.

Related tags

Sequences And ProgressionsNatural NumbersSum Of N TermsConsecutive SumsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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