Chip Eleven

Three players $A$, $B$ and $C$ draw chips from a bag containing 18 chips numbered 1 to 18, without replacement: first $A$ draws 6 chips, then $B$ draws 6 chips, then $C$ takes the remaining 6.

You are told that all 6 chips drawn by $A$ are odd-numbered. Given this, what is the probability that $B$ drew chip number 11? Give an exact fraction.