1st trail
Collision in first will have cases 1,1 2,2 3,3 4,4 5,5 6,6 So total 6 cases
Probability = 6/36 = 1/6
2nd trail
Collision will have cases 1,1 2,2 3,3 4,4 5,5 6,6 So total 6 cases
Probability = 6/36 = 1/6
3rd trIal
Anyone of them, wins means no collision
So Probality = 1-1/6 = 5/6
So
As they all are independent cases so the answer is 1/6*1/6*5/6
0.023