Example 2 - What is 20th term of an = (n - 1) (2 - n) (3 + n) - Finding Sequences

  1. Chapter 9 Class 11 Sequences and Series
  2. Serial order wise
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Example 2 What is the 20th term of the sequence defined by an = (n – 1) (2 – n) (3 + n) ? We need to find 20th term i.e. a20 Let an = (n – 1) (2 – n) (3 + n) putting n = 20 in (1) a20 = (20 – 1) (2 – 20) (3 + 20) = (19) × (– 18) × (23) = – 7866. Hence the 20th term is -7866

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