A group of ten people are attending the movies together. (a) Two of the ten insist on sitting side-by-side. In how many ways can the ten be seated together in a row? (b) Two of the people do not like each other and do not want to sit side-by-side. Now how many ways can the ten be seated together in a row?

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A:

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A:

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A:

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A:

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A:

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A: