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Suppose that number of runs scored off a delivery is uniform in {1, 2, 3, 4, 5, 6} independent of what happens in other deliveries.

Suppose that number of runs scored off a delivery is uniform in {1, 2, 3, 4, 5, 6} independent of what happens in other deliveries. A batsman played 3 deliveries then find the number of possible outcomes such that he hit 2 runs of at least 1 delivery.

The answer given is 91. I can't understand how this answer is coming. Please explain the steps.

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