Answer
if $n(B)=1$
Work Step by Step
Because
$n(A\times B)=n(A)*n(B)$ which only equals to $n(A)$ if $n(B)=1$
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 6 - Section 6.2 - Cardinality - Exercises - Page 417: 66
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