What is null set,sub set and universal set Answer: a null set is a set with no elements. a subset is a set inside a set, it is a set thats elements are all included in another set. for example: A={1,2,3} B={1,2,3,4,5} in set B, all the elements of set A are included, therefore, Set A is a subest of set B. a universal set is a set that combines every elements of every set. example: A={1,2,3} B={4,5,6} C={7,8,9,10} D={1,2,3,4,5,6,7,8,9,10} in here, set D is a universal set because every element of set A,B and C are included Step-by-step explanation: