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Ex 5.2, 8 - An AP consists of 50 terms of which 3rd term - Ex 5.2

  1. Chapter 5 Class 10 Arithmetic Progressions
  2. Serial order wise
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Ex 5.2 ,8 An A.P. consists of 50 terms of which 3rd term is 12 and the last term is 106. Find the 29th term We know that an = a + (n – 1) d From (1) and (2) 12 – 2d = 106 – 49d – 2d + 49d = 106 – 12 47d = 94 d = 94/47 d = 2 Putting the value of d in (1) a = 12 – 2d a = 12 – 2 × 2 a = 12 – 4 a = 8 Now we need to find 29th term i.e. a29 Now, an = a + (n – 1) d Putting values a29 = 8 + (29 – 1) × 2 = 8 + 28 × 2 = 8 + 56 = 64 Hence, 29th term = a29 = 64

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