Specify the set by roster.
?  
{Counting numbers containing only 4s.}
?  

A. 41, 42, 43, 44, ...
B. 44, 444, 4444, 44444, ...
C. 4, 444, 44444, 4444444, ...
D. 4, 44, 444, 4444, ...
E. 4, 14, 24, 34, 44, ...


Answer: D

Mathematics

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Mathematics