three
01111100 10111101 00000011
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53 bytes long
Memory dump which are in binary numbers would have many numbers of 0s and 1s. working with these numbers would be very difficult. Hence two number system hexadecimal and octal number system is used because these numbers are inter convertible with binary numbers by the concept of bits.
The ANSWER is 4
There are 168 = 4,294,967,296 such numbers.
4 digits - representing 16 integers.