Consider two sets A and B such that A ⊆ B. Find the possible values of x if A = {2, 4, 6, x} and B = {2, 3, 5, 6, x+1}. Ans: x = 3. Please explain.
The set is a subset of and is a superset of if and only if every element of is also an element of We use the notation to indicate that is a subset of the set
Compare the set and set
must be the element of must be the element of
Then and This system has the only solution
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