1.

The remainder when x' is divided by 5 equals the remainder when x' is divided by 4. Which of the following could not be a value of ?x'?

A.  \[20\]                                  
B.  \[24\]                  
C.         \[21\]                  
D.         \[22\]                  
Answer» C.         \[21\]                  


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