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Create a matrix

1 2 3 4

1 2 3 4 5

2 3 4 5 6

3 4 5 6 7

4 5 6 7 8

There is 2/16 chance to get 3, and 2/16 chance to get 7. Therefore, there is 4/16 or 1/4 chance to get either a 3 or a 7.

Answer: 1/4

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Related Questions

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