Hexadecimal numbers are made using the sixteen digits 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F. a. How many hexadecimal numbers are 4 digits long? b. How many 4-digit long hexadecimal numbers begin with A or B? c. How many hexadecimal numbers are 4 digits long with no repeating digits? d. How many hexadecimal numbers are 4 digits long and end in 6, and where the first digit must be from 3 to 5? Digits can repeat.

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