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\leftline{Mathematics 243 -- Algebraic Structures}
\leftline{Definitions Quiz 5 -- October 13, 2006}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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A) (5) What is the definition of the {\it inverse image} of a subset $T \subset B$
under a mapping $f : A \to B$?

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B) (5)  How many different integers $a$ satisfy $a | 20$?  (Include both positive
and negative $a$.)
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