Inductive proof has 2 cases.first one is the base case.we have to prove the statement for n=0
Second case is the induction step,it proves statement is true for any value n=k then it also hold true for n=k+1
Thus induction proof is done
for a set to be closed under an operation if the performance of the operation on given set always produces a member in the set
If any operation is performed on 2 elements in the set then the resultant value should be in the same set then it is called a set closed under operation
Set union is collection of all the elementsin set if this Operation is performed on 2sets then total elements in sets shoud be in the union set
If intersection operation is performed on 2 sets then the resultant set is common elements form both the sets
To find out the common elements between 2sets intersection operation is used
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