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deepaksoni
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Asked: 2021-04-30T07:05:38+05:30 In:

Problem 2: Find the indicated terms in each of the following sequences whose nth terms are(iii) an = n(n – 1)(n – 2); a5 and a8

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This is the basic and conceptual question from Chapter name- Arithmetic Progression
Chapter number- 9
Exercise 9.1
We have to find the indicated terms asked in the question whose nth term is an= n(n – 1)(n – 2)

CBSE DHANPAT RAI publications
Class:- 10th
Understanding CBSE Mathematics
Question 2(iii)

arithmetic progressionclass 10thrd sharma
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    1 Answer

    1. Guru

      Solution: 

      Given:

      an = n(n – 1)(n – 2)

      By putting n=5

      a5 = 5(5 – 1).(5 – 2) = 5.4.3 = 60

      By putting n=8

      a8 = 8.(8 – 1).(8 – 2) = (8.7.6) = 336

      ∴ The required terms a5= 60, a8 = 336

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