Question: In a digital control system, the control commands are represented by a set of four hexadecimal characters. (a) Determine the total number of control commands

In a digital control system, the control commands are represented by a set of four hexadecimal characters. (a) Determine the total number of control commands possible with this scheme. (b) If each control command must have a unique prex, i.e. starting from left to right no hex character can be repeated, determine how many control commands are possible.

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