hashing

Question

A hash table is used when number of keys actually stored it any point of time is small as compared to the number of possible keys.

please explain this line with suitable example.

Answer 1

It means number of keys to be inserted in the hash table should be less than or equal to the hash table size

for example-if there are 10 keys {1,2,3,4,5,6,7,8,9,10} then the size of hash table should be greater than or equal to 10.