Question

if a=(3,4,5) ; b=(1,2,3) then find a∆b​

Answer 1

A∆B which is called the symmetric difference between A and B is defined as (A-B)U(B-A).

Now, A-B is the set of all elements which are in A but not in B. So, A - B = {1,2}.

Similarly, B-A is the set of all elements which are in B but not in A. So, B - A = {5}.

Hence A ∆ B = (A-B)U(B-A) = {1,2,5}

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