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Class 9MathematicsSequences and ProgressionsSum of first n natural numbersEasyLevel 62
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What is the sum of the first (10) natural numbers?

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Answer and explanation

Correct answer: (55)

Using (S_n=\frac{n(n+1)}{2}), (S_{10}=\frac{10\cdot11}{2}=55). In exams, put the correct value of (n).

Related tags

SequencesProgressionsNatural-NumbersSum

Frequently asked questions

What is the correct answer to this question?

(55)

Why is this the correct answer?

Using (S_n=\frac{n(n+1)}{2}), (S_{10}=\frac{10\cdot11}{2}=55). In exams, put the correct value of (n).

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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  1. 1Let A = {x : x is a natural number and x < 4}. What is A?
  2. 2What will be the 9th term in the sequence (3, −6, 12, −24, …)?
  3. 3If (a=10) and (d=2), what will be the sum of the first (6) terms?
  4. 4If a = 7 and d = 3, what is the sum of the first 6 terms?
  5. 5What is the sum of the first 6 terms of the arithmetic progression (15, 21, 27, 33, ...)?
  6. 6Find the sum of the first (20) natural numbers.
  7. 7If \(S_n=\frac{n(n+1)}{2}\), what is \(S_{15}\)?
  8. 8What is the value of (1+2+3+\cdots+25)?
  9. 9Which is the sum of the first (30) natural numbers?
  10. 10How much is the sum of the first (12) natural numbers?
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