What i thought was that, after mapping these elements using chaining, there are 5 slots left.
So any element that comes afterwards will want to be mapped to any of the 11 slots but it has only 5 available. Probability of all the 11 slts are the same since mod function is uniformally distributed.
So the required probability will be 5/11=0.45
what M.E. says: any element will map to 1 of the 5 slots so it will be 1/5=0.2
