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To get a sum strictly less than 4 (i.e. 2 or 3), there are 3 possible combinations. You could get two 1's, a 2 and a 1, or a 1 and a 2. Anything over than this leads to a sum of at least 4. These events all carry the same probability (1/36), so your probability should be 1 - 3/36 = 33/36.

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