89) A decimal number has 30 digits. Approximately, how many digits would the binary representation have?

90) A circuit produces 1 ′s complement of the input word, one application is binary subtraction. It is called

91) The most commonly used character codes for transmission is

92) How many different number a 6-bit binary word can represent?

93) (r-1) ′s complement of the (r-1) ′s complement of an integer number is