Radix is a mathematical term that is defined as the base of a numerical system. If you would like to understand more about what a radix is then the radix Wikipedia page will help in your knowledge http://en.wikipedia.org/wiki/Radix. In the above question, the base number in your numerical problem is 7. The hexadecimal number is a number that has a base or radix of 16, in other words each digit runs from 0 to 15 instead of 0 to 9 in a traditional numerical system. In this instance your hexadecimal number is the E78.
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