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a) the value of t1 and d (2 marks)

b) an explicit formula for the general term (2 marks)
c) t20 (2 marks)

3a, 3a – 2b, 3a – 4b, 3a – 6b, …

Surely you can determine T1 ??

Clearly d = -2b

So now just apply your formulas.

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