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How much is the sum of natural numbers from (101) to (120)?

Answer and explanation

Correct answer: 2210

There are 20 numbers from 101 to 120, inclusive. Therefore, using the sum of an arithmetic progression,
\(S=\frac{20}{2}(101+120)=10\times221=2210\). Hence, option B is correct. The value 2190 is the sum from 100 to 119, so it does not match the given range. Exam tip: Count terms in an inclusive range using \(\text{last term}-\text{first term}+1\).

Related tags

Sequences And ProgressionsArithmetic ProgressionSum Of Natural NumbersRange SumClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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