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https://gateoverflow.in/34051/backoff-time-period

same question only A replace with B

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After 2nd Collison  a collision no =1 and B collision no=2(as A win first race)
So possible cases are
A   B
0    0 (collide)
0    1
0    2
0    3
1    0 ( B win )
1    1
1    2
1    3
Thus p (B win 2nd Collison )=1/8=.125