Roll three regular hexahedral dice marked with 1, 2, 3, 4, 5 and 6 at the same time, and the numbers are a, B and C respectively. Then the probability that a, B and C are exactly the three sides of a right triangle is () A. 1216B. 172C. 136D. 112

P (a, B, C is exactly the length of three sides of a right triangle) = 6216 = 136

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