Two dice are thrown together. The probability of getting the difference of numbers on their upper faces equals to 3 is:

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Step 1: Favourable outcomes where difference is 3: $(1,4), (4,1), (2,5), (5,2), (3,6), (6,3) = 6$ outcomes. Total outcomes $= 36$.
Step 2: P(difference $= 3$) $= \frac{6}{36} = \frac{1}{6}$

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