Lars has 9 different math textbooks, 12 different chemistry books and 6 different biology books. He arranges these twenty-seven books randomly on a shelf. What is the probability that books of the same subject are all together? A. B. O C. O D. O E. 1 3! 9!12!6! 9!12!6! 27! 3!9!12!6! 27! 1 9!12!6!

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