Answer :

We know ,n(A×B)=n(A)×n(B)

Similarly, n(A×B×C)=n(A)×n(B)×n(C)

Here, n(A)=3 and n(B)=4

n(A×A×C)=n(A)×n(A)×n(B)

=3×3×4

=36

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