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You have two grandmothers living in Manhattan—one in the north and one in the south. There are six trains that run between 4 PM and 5 PM: three go north and three go south, alternating in their schedule. Each day, you arrive at the train station randomly between 4 PM and 5 PM. At the end of the year, you realize that you've visited your grandmother in the north 70% of the time, while you would expect it to be 50%. Why is this the case?
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Cargo Ops Execution Manager

Interviewed at United Airlines

3.8★
Oct 14, 2024

You have two grandmothers living in Manhattan—one in the north and one in the south. There are six trains that run between 4 PM and 5 PM: three go north and three go south, alternating in their schedule. Each day, you arrive at the train station randomly between 4 PM and 5 PM. At the end of the year, you realize that you've visited your grandmother in the north 70% of the time, while you would expect it to be 50%. Why is this the case?

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