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Class 9MathematicsSequences and Progressionsnth termEasyLevel 60
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If (a_n=n^2+n), what is the fourth term?

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Answer and explanation

Correct answer: 20

For the fourth term, substitute n=4. Thus, a_4=4^2+4=16+4=20. Therefore, 20 is the correct answer. The value 16 is only 4^2; the additional +4 must also be included. Exam tip: when finding an nth term, substitute the term number carefully in the formula.

Related tags

Sequences And ProgressionsNth TermSubstitutionQuadratic SequenceClass 9 Mathematics

Frequently asked questions

What is the correct answer to this question?

20

Why is this the correct answer?

For the fourth term, substitute n=4. Thus, a_4=4^2+4=16+4=20. Therefore, 20 is the correct answer. The value 16 is only 4^2; the additional +4 must also be included. Exam tip: when finding an nth term, substitute the term number carefully in the formula.

Which subject and chapter does this question cover?

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

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10 more MCQs
  1. 1In the sequence (1,4,9,16,...), what is the difference between the 15th term and the 14th term?
  2. 2What is the 25th term of the sequence (-5,-1,3,7,...)?
  3. 3If aₙ = n³ − n, what will be the value of a₇ − a₅?
  4. 4What will be the 12th term in the sequence (3, 5, 9, 15, 23, ...)?
  5. 5If a_n = n(n + 2), what will be the value of a_11 − a_8?
  6. 6If a_n = n^2 + 5n - 2, which term is equal to 148?
  7. 7The sequence (3, 8, 15, 24, …) has general term a_n = n² + 2n. Which term is 168?
  8. 8If a_n = n³ + n², what will be the value of a_6 − a_4?
  9. 9If a_n = 4n² − 1, which term is 575?
  10. 10In the sequence (1, 4, 9, 16, …), what will be the value of a_11 + a_12?
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