12. 10100 is the two's complement representation of:

  1. -11
  2. +12
  3. -12
  4. -20
  5. +20

3 is CORRECT. Since 10100 is a 2s complement negative number, the positive number corresponding to 10100 may be obtained by computing the 2's complement of 10100 as follows: 2's[10100] = 01011+1=01100 = +12 Conclusion: 10100 = -12, negative because the left-most bit is a 1.

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