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Class 9MathematicsSequences and ProgressionsSequencesExpert
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The sequence (2,12,36,80,150,\ldots) has general term (a_n=n^3+n^2). What will be (a_8-a_6)?

Answer and explanation

Correct answer: (336)

(a_8=576) and (a_6=252), so the difference is (324), not (336). Recheck cube and square calculations carefully.

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SequencesCubic-Plus-SquareDifferenceClass-9Sequences And ProgressionsMathematicsClass 9 Mcq
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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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