ISRO Computer Science (CSE) 2007 - Question 4

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When two numbers are added in excess-3 code and the sum is less than 9, then in order to get the correct answer it is necessary to

  • A. subtract 0011 from the sum
  • B. add 0011 to the sum
  • C. subtract 0110 from the sum
  • D. add 0110 to the sum

Answer: A. subtract 0011 from the sum

Explanation: In Excess-3 addition, if no carry is generated (sum < 9), we must subtract 3 (0011) to get the correct Excess-3 result.

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