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A = (⁴ ₂) = 6
P(A) = 6/276 = 1/46
B = (⁶ ₁) * (¹⁸ ₁) + (⁶ ₂) = 6*18 + 15 = 123
P(B) = 123/276 = 41/92
C = (¹² ₂) + (¹² ₂) = 66 +66 = 132
P(C) = 132/276 = 11/23