Probability of corners and the postage stamp patterns is bingo game.

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I am very new to this bingo game and want to know how to calculate probability of a particular pattern in bingo game. Here each column has number in range of 1-15, 16-30, 31-45, 46-60 ,and 61-75. Same goes for ball calls which is a randomized pool of 40 balls. Kindly guide me on this .