Question 1076130
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OK, I'll also do e).  I'm the same "Edwin" as the "Edwin" above. :)

n(A×B)

When there is an × between two sets, that means to make all 
possible ordered pairs of elements, where each ordered pair
of elements has its first coordinate from the first set and
the second coordinate from the second set.  So 

A×B = { (2,5),(2,^),(2,z),(2,8),(2,p),
        (5,5),(5,^),(5,z),(5,8),(5,p),
        (8,5),(8,^),(8,z),(8,8),(8,p),
        (z,5),(z,^),(z,z),(z,8),(z,p),
        ($,5),($,^),($,z),($,8),($,p) }

n(A×B) means the number of elements in A×B.

That, of course is 25, which can be gotten by multiplying
the number of elements in A, which is n(A), by the number
of elements in B, which is n(B).  

So n(A×B) = n(A)&#8729;n(B) = 5&#8729;5 = 25.

It is not necessary to write out all the elements of A×B
as I did above, when you're only asked for n(A×B). If 
that's all you're asked to find, you only need to multiply 
the numbers of elements in them.  I only wrote all of A×B 
out to show you what A×B means.  [BTW, don't use the same 
symbol for set multiplication as you use for number 
multiplication.  I used × for set multiplication and &#8729; 
for number multiplication].

Edwin</pre><b></font>