A salesman has 12 customers to visit each day. In how many different ways can he visit

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A salesman has 12 customers to visit each day. In how many different ways can he visit the customers? One day he has time to visit only eight customers. In how many different ways can he select the eight? As the salesman has to travel between customers, the order in which his visits are scheduled is important.
How many different schedules are there for eight customers?

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