<p> Answers to Chapter 3 Review Questions</p><p>1. a) 2 b) 4 c) 7 d) 11 e) 12 f) 18 g) 21 h) 31 i) 205 j) 227</p><p>2. a) 111 b) 10011 c) 11100 d) 101110 e) 111001 f) 1010110 g) 1011110 h) 1110000 i) 10010100 j) 11100110</p><p>3. a) 30 b) 68 c) 80 d) 142 e) 240 f) 846</p><p>4. a) 111100 b) 10110000 c) 1001010000 d) 110100100 e) 10101101001 f) 10011000110100</p><p>5. a) 90 b) 199 c) 2485 d) 422</p><p>6. a) 1001100 b) 1101000 c) 11011010010 d) 1100011011</p><p>7. a) 0001 0100 0110 BCD b) 0011 1000 1001 BCD c) 0001 0110 0111 1000 BCD d) 0010 0101 0000 0010 BCD</p><p>8. Only one digit changes as you count up from zero</p><p>9. The binary system uses only the digits 0 and 1, and computer circuits can easily distinguish between the two voltage levels that correspond to the binary digits 0 and 1.</p><p>10. a) Each digit of a binary number b) A group of 8 bits c) A group of 1 or more bytes d) The digit that represents the smallest value e) the digit that represents the largest value</p><p>11. a) Base 8 b) Base 10 c) Base 2 d) Base 16</p><p>12. An extra digit used to represent the polarity of a binary number 13. The 1’s complement of a binary number is the number that results when all the 1’s are changed to 0’s and all the 0’s are changed to 1’s.</p><p>14. An alphanumeric code, which includes letters as well as numbers</p><p>15. To detect errors that may occur while a word is being moved</p><p>16. a) 1101 b) 1000 c) 10111</p><p>17. a) 1000 b) 11 c) 101</p><p>18. a) 100100 b) 1010 c) 1111</p><p>19. a) 101 b) 100 c) 11011</p>