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n(s) mata dadu sama = 6
n(S) = 36 -6 = 30
n(berjumlah 9 ) = (3,6) (4,5) (5,4) (6,3) = 4
n(tidak berjumlah 9) = 30-4 = 26
P = n(A) / n(S)
= 26 / 30 = 13/15