Find the smallest set A such that

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Question:
Find the smallest set A such that $A \cup 1, 2 = 1, 2, 3, 5, 9 "> A \cup {1, 2} = {1, 2, 3, 5, 9}$ .

Solution:

We have to find the smallest set A such that $A \cup 1, 2 = 1, 2, 3, 5, 9 "> A \cup {1, 2} = {1, 2, 3, 5, 9}$ .

The union of the two sets A & B is the set of all those elements that belong to A or to B or to both A & B.

Thus, A must be {3, 5, 9}.

Find the smallest set A such that

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