In an arithmetic series, the 6th term is 39 In the same arithmetic series, the 19th term is 7.8 Work out the sum of the first 25 terms of the arithmetic series.

Mathematics

IGCSE&ALevel

EDEXCEL

Exam No：4MA1_1HR_que_20201104 Year：2020 Question No：IGCSE&ALevelMathematics2020IG1720

Answer:

3: Sequences, functions and graphs

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