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in 2's Complement there is only one zero: All zeros

In 1's Complement there are two zeros: All zeros, and All ones ("negative" zero).

So you have one less signed number you can represent with the same amount of bits.

For example, with 8 bits, with 2's Complement you can represent -128 to +127 while with 1's complement you can only represent -127 to +127.

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