2026 IGCSE Additional Mathematics May/June 0606/13 Q2

2026 IGCSE Additional Mathematics May/June 0606/13 Q2

5 marks

An arithmetic progression has first term \(a\) and common difference \(d\), where \(a\ne0\) and \(d\ne0\).

  • The sum of the 6th and 11th terms is 0.
  • The sum of the first 6 terms is −30.

Find the values of \(a\) and \(d\).[5]

Solution:

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Answer:\(a=-\dfrac{15}{2},\ d=1\)

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