It is a way to represent values with a balanced number of positive and negative numbers. The primary advantage of XS-3 coding over BCD coding is that a decimal number can be nines' complemented (for subtraction) as easily as a binary number can be ones' complemented; just invert all bits.
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Binary code of 4 is 0100. To get Excess-3 code, add 11(binary code of 3) to binary code of desired number, here it is 4. Hence, Excess-3 Code for 4 is 0111.
3 converted into binary code is 00000011
Excess doesn't have an adverb.
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