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A box contains 9 balls numbered 1 to 9.one ball is removed at a random from the box and replaced and the process repeated two

A box contains 9 balls numbered 1 to 9.one ball is removed at a random from the box and replaced and the process repeated two more times.the numbers on the box that are removed are written down in the order in which they are removed forming a three digit number.how many different numbers can be obtained in this way?

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