Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5

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问题 Martha invited 4 friends to go with her to the movies. There are 120 different ways in which they can sit together in a row of 5 seats, one person per seat. In how many of those ways is Martha sitting in the middle seat?

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答案24

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