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How much is the sum of natural numbers from (211) to (260)?

Answer and explanation

Correct answer: 11775

There are 50 terms from 211 to 260, inclusive. Using the arithmetic progression sum formula, \(S=\frac{n}{2}(\text{first term}+\text{last term})\), we get \(S=\frac{50}{2}(211+260)=25\times471=11775\). Hence, option B is correct. A nearby value such as 11675 may result from counting the number of terms incorrectly. Exam tip: when both endpoints are included, use \(\text{last}-\text{first}+1\) for the number of terms.

Related tags

Arithmetic ProgressionNatural NumbersSum Of TermsSequence SumsClass 9 MathematicsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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