Question 778089
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C' consists of every element of U that is not in C.  Re-write U enumerating all of the elements.  Cross out any element of U that is listed in C.  What is left is C'.  In this case, since the largest element of U is 18 and the smallest element of C is 21, C' and U are identical.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
<font face="Math1" size="+2">Egw to Beta kai to Sigma</font>
My calculator said it, I believe it, that settles it
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