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What is the difference between the sum of the first (36) natural numbers and the sum of the first (30) natural numbers?

Answer and explanation

Correct answer: 201

The sum of the first 36 natural numbers is \,\(S_{36}=\frac{36\times37}{2}=666\), and the sum of the first 30 natural numbers is \,\(S_{30}=\frac{30\times31}{2}=465\). Therefore, the difference is \,\(666-465=201\). It is also the sum of the numbers from 31 to 36. Option 191 would be close to a sum ending at 35, but it does not include 36. Exam tip: The difference of two initial sums equals the sum of the terms left between them.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of Natural NumbersArithmetic CalculationSum Of First N Natural NumbersClass 9 Mcq

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