Question 943666
being "exactly in the middle" means that there are an equal number of cars behind and in front of the "middle" car:
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if the "middle" car is the 9th car, there are 8 cars in front and 8 cars behind the "middle" car:
8 + 8 = 16
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add to that the "middle" car:
16 + 1 = 17
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answer
17 cars total
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