Choose the correct option for the sum of the first (33) natural numbers.
Answer and explanation
Correct answer: 561
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Substituting \(n=33\), we get \(\frac{33\times34}{2}=33\times17=561\). Therefore, option B is correct. A value such as 551 would result from an arithmetic error. Exam tip: always use the next number, \(n+1\), in the formula.
Frequently asked questions
What is the correct answer to this question?
561
Why is this the correct answer?
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Substituting \(n=33\), we get \(\frac{33\times34}{2}=33\times17=561\). Therefore, option B is correct. A value such as 551 would result from an arithmetic error. Exam tip: always use the next number, \(n+1\), in the formula.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.
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