2025 IGCSE Additional Mathematics October/November 0606/22 Q8

2025 IGCSE Additional Mathematics October/November 0606/22 Q8

7 marks

An arithmetic progression has first term \(t\) and common difference 1.5.

The 4th, 8th and 20th terms of this arithmetic progression form the 1st, 2nd and 3rd terms of a geometric progression.

  1. Find the value of \(t\).[5]
  2. Find the common ratio of the geometric progression.[2]

Solution:

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Answer:(a) \(t=-1.5\) (b) 3

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