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Hi,
Find the probability of rolling a sum of 7 with two dice
P(sum = 7) = 6/36 = 1/6
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1|_2_3_4__5__6__7
2|_3_4_5__6__7__8
3|_4_5_6__7__8__9
4|_5_6_7__8__9_10
5|_6_7_8__9_10_11
6|_7_8_9_10_11_12