Answer to Question #281205 in Discrete Mathematics for Anonymous005

Question #281205

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.


1
Expert's answer
2021-12-30T17:37:22-0500

The set AA is a subset of B,B, and BB is a superset of A,A, if and only if every element of AA is also an element of B.B. We use the notation ABA ⊆ B to indicate that AA is a subset of the set B.B.

Compare the set AA and set B.B.

44 must be the element of B,xB,x must be the element of B.B.

Then 4=x+14=x+1 and x=3.x=3. This system has the only solution x=3.x=3.



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