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Before telling you what the right answer is, let

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me remind you that the fault is related to

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the code, and is a necessary, but not sufficient

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condition for the occurrence of a failure. So in this

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case, a single faulty line is responsible for the

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failure, which is line three. So the correct answer, is

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three. At line three, the program computes i times

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i, instead of i times 2, as it should do.