(ISBN correction Find the missing digit in the ISBN numbers below.
(a) 0-385-49531-?
(b) 0-201-1?794-2
(ISBN code)
(a) Show that the ISBN code can detect an error that is either a transposition of two digits or a numerical error in a single digit.
(b) Show that if the position of a single error is known, it can be corrected.
(c) Show that the ISBN code is a (nonlinear) (10, 109, 2) code.