Martha invited 4 friends to go with her to the movies. There are 120 different w

游客2025-02-24 34

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

解析

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InhowmanydifferentwayscanthelettersinthewordSTUDYbeordered?5!=120

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Marthainvited4friendstogowithhertothemovies.Thereare120differentw

Agroupof20valueshasameanof85andamedianof80.Adifferentgroupof3

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