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A warehouse manager plans to assign each county a code consisting of either a single digit or a pair of distinct digits written in increasing order (i.e. 12 and not 21). What is the least number of digits that he can use if there are a total of 16 counties?
A. 4
A. 5
C. 6
D. 7
E. 8
Answer: C
Source: e-GMAT
A. 4
A. 5
C. 6
D. 7
E. 8
Answer: C
Source: e-GMAT
