a) How many bits would be required if one wishes to code each of the seven days of a week with a binary number. b) How many bits would be required if one wishes to code all upper-case letters plus all the lower-case letters plus all the 10 digits of the decimal numbers each with a unique combination of 1's and 0's. c) How many bits would be required if each of Lehigh's 5047 undergraduate students (according to Lehigh's web site) is to receive a unique binary number (UBN). d) How many additional students could Lehigh enroll given your answer to part (c) without having to change the way the UBNs are formed.