Solution :
Total possible ways to rolled a die twice is 6^2 = 36
The possible outcomes to the sum of the two rolls equals 7 is
6
{(1,6),(2,5),(3,4),(4,3),(5,2),(6,1)}
The probability that the sum of the two rolls equals to 7 is =
possible outcomes/total possible ways
= 6/36 = 1/6
= 0.1667
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