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From 12 books on a shelf; 4 are economics, 3 are mathematics, 3 are physics and...

From 12 books on a shelf; 4 are economics, 3 are mathematics, 3 are physics and 2 are chemistry books. 4 books are randomly selected from the shelf. X discrete random variable; It is defined as "X = number of math books". Accordingly, X is a discrete random variable
a) Find the probability distribution table.
b) Find P (X-1).
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