I have 10 red and 10 blue cards. I shuffle the cards and then label the cards

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I have 10 red and 10 blue cards. I shuffle the cards and then label the cards based on their orders: I write the number one on the first card, the number two on the second card, and so on. What is the probability that

a. All red cards are assigned numbers less than or equal to 15?

b. Exactly 8 red cards are assigned numbers less than or equal to 15?

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