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Class 9MathematicsSequences and ProgressionsSum of first n natural numbersMediumLevel 60
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In a triangular decoration, beads are placed in rows from (1) to (19). How many beads are there in total?

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Answer and explanation

Correct answer: (190)

Total beads are (S_{19}=\frac{19\times20}{2}=190). Triangular rows often give the sum of natural numbers.

Related tags

MathSequencesNatural-NumbersSum

Frequently asked questions

What is the correct answer to this question?

(190)

Why is this the correct answer?

Total beads are (S_{19}=\frac{19\times20}{2}=190). Triangular rows often give the sum of natural numbers.

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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10 more MCQs
  1. 1Let A = {x : x is a natural number and x < 4}. What is A?
  2. 2If (a=10) and (d=2), what will be the sum of the first (6) terms?
  3. 3If a = 7 and d = 3, what is the sum of the first 6 terms?
  4. 4What is the sum of the first 6 terms of the arithmetic progression (15, 21, 27, 33, ...)?
  5. 5What is the sum of the first (10) natural numbers?
  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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