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Class 9MathematicsSequences and ProgressionsSequencesExpertLevel 41
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What will be the (20)th term in the sequence (3,6,10,15,21,\ldots)?

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Answer and explanation

Correct answer: (231)

This sequence gives (\frac{(n+1)(n+2)}{2}). For the (20)th term, (\frac{21\times22}{2}=231).

Related tags

SequencesTriangular-NumbersNth-TermClass-9

Frequently asked questions

What is the correct answer to this question?

(231)

Why is this the correct answer?

This sequence gives (\frac{(n+1)(n+2)}{2}). For the (20)th term, (\frac{21\times22}{2}=231).

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sequences.

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10 more MCQs
  1. 1What is the next term of the sequence (2,4,6,8,\ldots)?
  2. 2What is the fifth term of the sequence (5,10,15,20,\ldots)?
  3. 3Which is the fourth term in the sequence (1,3,5,7,\ldots)?
  4. 4What will be the next term of (10,20,30,40,\ldots)?
  5. 5What is the next term of (12,11,10,9,\ldots)?
  6. 6What is the sixth term of (4,8,12,16,\ldots)?
  7. 7What is the third term in (7,14,21,28,\ldots)?
  8. 8What is the next term of (30,27,24,21,\ldots)?
  9. 9The sequence (9,18,27,36,\ldots) consists of multiples of which number?
  10. 10What will be the next term of (100,90,80,70,\ldots)?
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