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berjumlah prima :
2 = (1,1)
3 = (1,2), (2,1)
5 = (2,3),(3,2), (1,4), (4,1)
7 = (1,6), (6,1), (2,5), (5,2), (3,4), (4,3)
11 = (6,5), (5,6)
n(A) = 15
p(A) = n(A)/n(S) = 15/36 = 5/12