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S = 3 x 12 = 36
n(S) = 36 C2 = 36!/2!.34! = 36.35.34!/ 2.1. 34! = 630
n(A) = 31 C2 = 31!/2!. 29! = 31.30.29!/2.1. 29! = 465
P(A) = n(A)/n(S)= 465/630 =31/42