Which is the sum of the first (7) natural numbers?
Answer and explanation
Correct answer: 28
The first 7 natural numbers are 1, 2, 3, 4, 5, 6 and 7. Their sum is \(1+2+3+4+5+6+7=28\). Therefore, 28 is correct. The value 21 is the sum of the first 6 natural numbers, so it is a close but incorrect option. Exam tip: the sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\).
Frequently asked questions
What is the correct answer to this question?
28
Why is this the correct answer?
The first 7 natural numbers are 1, 2, 3, 4, 5, 6 and 7. Their sum is \(1+2+3+4+5+6+7=28\). Therefore, 28 is correct. The value 21 is the sum of the first 6 natural numbers, so it is a close but incorrect option. Exam tip: the sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\).
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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