A 5-digit number has the property that the number formed by its first three digits is the same as
the number formed by its last three digits (without changing the order of digits). What is the
minimum number of times any digit can appear in this number?

Answer: C. 2

For the first three digits (ABC) to equal the last three (CDE), the digits must overlap.
The pattern forces the number to look like A B A B A (for example, 1 2 1 2 1).
In this pattern, the digit 'A' appears 3 times and the digit 'B' appears 2 times.
Since both 'A' and 'B' are digits within the number, the lowest count is 2.
The correct answer is c) 2.

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