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13 A luxury car manufacturer sets up a factory for a new model. In the first month only 5 cars are
produced. After this, 13 cars are assembled every month.
a.List the total number of cars that have been made in the factory by the end of each of the first
six months.
b.Explain why the total number of cars made after n months forms an arithmetic sequence.
C.How many cars are made in the first year?
d.How long is it until the 250th car is manufactured?