In an experiment on social interaction 7 people including Darrell will sit in 7 seats in a row a In how many ways can this be

Question

In an experiment on social interaction 7 people including Darrell will sit in 7 seats in a row a In how many ways can this be done b In how many ways can this be done if Darrell always sits in the middle seat a There are ways 7 people can sit in 7 seats in a row Type a whole number

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