Ans. Option A - less than 1. This is a theorem in Universal Hashing - "If h is chosen from a universal collection of hash functions and is used to hash n keys into a table of size m, where n<=m, the expected number of collisions involving a particular key x is less than 1." Reference: You can check the "Universal Hashing" section of the following link (for details): http://www.cs.nmsu.edu/~ipivkina/Spring08cs372/Cormen/chapter12HashTables.htm
And a simiar question has been asked earlier too.
Please refer Cormen on Algorithm for further reading. Yeah!!!
Refer d link below as well:
https://gateoverflow.in/45237/hashing
I hope d explanation helps u. :)
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