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The dice will show a sum of 7 if you roll
• 1 and 6
• 2 and 5 (2 ways)
• 3 and 4 (3 ways)
so there are 6 ways of rolling a sum of 7. Out of 6 × 6 = 36 possible outcomes, the probability of rolling a sum of 7 is 6/36 = 1/6.