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What is the proper definition for closed and open hashing? They seem to be used interchangeably in the following two questions

  • Consider a hash table of size seven, with starting index zero, and a hash function (3x+4)mod7(3x+4)mod7. Assuming the hash table is initially empty, which of the following is the contents of the table when the sequence 1,3,8,101,3,8,10 is inserted into the table using closed hashing? Note that − denotes an empty location in the table.GATE2007-40
  • The keys 12,18,13,2,3,23,512,18,13,2,3,23,5 and 1515 are inserted into an initially empty hash table of length 1010 using open addressing with hash function h(k)=kmod10h(k)=kmod10 and linear probing. What is the resultant hash table GATE 2009-36


My understanding is that Open refers to when the keys don’t have to be confined to the Hash table only and hence “open” using a linked list for each case. Closed on the other hand using the same table and methods like probing and double hashing.

Right now I am just assuming that whenever linear probing to used closed.

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