2025 SJI P1 Q2

2025 SJI P1 Q2

IB Year 5 | Grade 11
5 marks

The fourth term of an arithmetic series is \(9-\ln27\) and the sum of its first ten terms is \(120-45\ln3\). Find the first term, \(a\), of the arithmetic sequence, where \(a\in\mathbb Z\).[5]

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Answer:\(a=3\)

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