PDF chapter test TRY NOW

Consider the following sets.
 
\(A =\) 2,3,7,10, \(B =\) 6,11,16,17 and \(C =\) 13,20,21,24.
 
1. 21C is .
 
2. 16B is .
 
3. 3A is .
 
4. 6A is .