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A - Angka
B - Bukan angka
A B B = 3!/2! = 3
A A B = 3!/2! = 3
A A A = 3!/3! = 1
n(A) = 7
n(S) = 2 × 2 × 2 = 8
p(A) = n(A)/n(S) = 7/8