Choose the correct sum of (1+2+3+\cdots+34).
Answer and explanation
Correct answer: 595
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Here, \(n=34\), so \(\frac{34\times35}{2}=17\times35=595\). Therefore, 595 is correct. A value such as 585 may result from an error while multiplying or dividing by 2. Exam tip: when the last term is \(n\), directly use \(\frac{n(n+1)}{2}\).
Frequently asked questions
What is the correct answer to this question?
595
Why is this the correct answer?
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Here, \(n=34\), so \(\frac{34\times35}{2}=17\times35=595\). Therefore, 595 is correct. A value such as 585 may result from an error while multiplying or dividing by 2. Exam tip: when the last term is \(n\), directly use \(\frac{n(n+1)}{2}\).
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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