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A ={peluang muncul bukan angka prima}
A = {(1,1),(1,4),(1,6),(4,1),(4,4),(4,6),(6,1),(6,4),(6,6)}
n(A) = 9/36=1/4
Angka bukan prima : 1, 4, 6
3/6 x 2 = 1