Consider the following part of an ISBN code:

0-631-20162-?

What should the check digit be? Enter a single digit or an X.

Consider the following part of an ISBN code: 0-631-20162-? What should the check digit be? Enter a single digit or an X. Consider the following invalid ISBN code: 0-15-503483-X The second-to-the-last digit (i.e., the 3) is wrong. What should it be? (Remember that the 'X' represents the number 10.) Enter a single digit or an X Consider the following partial credit card number: 4777 2032 6784 202? What value should the check digit be? Enter a single digit. Cindy transmitted a four-letter word to Donald. After her computer took the ASCII representation for the word and applied the Hamming(7,4) code, Bob received this: 1100011 0011001 1001110 0111101 0101010 1110000 1101010 Unfortunately, there were a number of errors in the transmission. Fortunately, however, there was never more than one bit error in any 7- bit block, and hence the Hamming(7,4) code was able to fix them all. Type in the four-letter word (using letters of the alphabet) that Cindy originally sent, in lower case. (Note: Assume that the data occurs in the format we described in class whereby the three parity bits follow the four data bits, i.e. d4 d2 d3 d4 P1 P2 P3 . This may differ from the order found in descriptions of Hamming(7,4) found on the web.)