The CompTIA Tech+ Study Guide (Exam FC0-U71, 3rd Edition, 2025) defines hexadecimal as follows:
“The hexadecimal notational system, or base-16… In hex, the numbers 0 to 9 are used, just like in decimal. However, the letters A to F are used to represent decimal numbers 10 through 15.”
This directly confirms that hexadecimal uses digits 0–9 and letters A–F.
Verified Reference:
Chapter 6: Software Development Concepts — “Notational Systems” (pp. 357–359).
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