There are 6 numbered balls in a bag. Each ball has a distinct number and the numbers are in {1,2, 3, 4,5, 6}. Student A takes a ball from the bag randomly and records the number on the selected ball. The ball is taken without replacement. Student B then takes a ball from the bag randomly and records the number on his/her selected ball. Let X1 denote the number recorded by student A and X2 be the number recorded by student B. What's the probability of X1 > X2?

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