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17-20 in matgaret grove maths in focus 2U book

17-20 in Maths in Focus Mathematics hsc book 17. the first negative term of the series tn=1000-2n 18. The first positive term of the series tn=2n-300 19.a) the first negative term of the series un=80-6n b) the first negative term 20. The first negative term of the series tn=50-7n