Question: Let x = { a , , b } and Y = { a , } . It is the case that | x Y

Let x={a,,b} and Y={a,}.
It is the case that |xY|=|x*Y|, where 'dot' between X and Y
denotes concatenation.
True
False
Let x = { a , , b } and Y = { a , } . It is the

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