There are 10 seats in a row in a waiting room. There are six

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There are 10 seats in a row in a waiting room. There are six people in the room.
(a)In how many different ways can they be seated?
(b)In the group of six people, there are three sisters who must sit next to each other. In how many different ways can the group be seated?

(a) 151200
(b) 30240
this is my answers,I don't konw whether they're right or not..

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