সংযোজিত ফংশন

If AA and BB have nn elements in common, then the number of elements common to A×BA\times B and B×AB\times A is

হানি নাটস

If there are mm elements in AA and mm elements in B,A×BB, A \times B and B×AB \times A both will be having m2m^2 elements.
Since there are nn elements common to AA and BB, there will be n2n^2 such pairs in A×BA \times B and B×AB \times A, which will have both the elements same.
Since the elements are same, they are commutative and hence there will be n2n^2 elements common to A×BA \times B and B×AB \times A

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