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A deck of cards contains 10 read cards numbered 1 to 10 and 10 black cards numbered 1 to 10. How many ways are there

A deck of cards contains 10 read cards numbered 1 to 10 and 10 black cards numbered 1 to 10. How many ways are there of arranging the 20 cards in a row? Suppose we draw the cards at random and lay them in a row. What is the probability that red and black cards alternate?

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