how can you tell if a binary number is negative or positive?(adsbygoogle = window.adsbygoogle || []).push({});

1111 <--- how do you know if this is 15 or -1?

and for my project i have to make a 4 bit subtracter using LED lights to show 1's or 0's. Do I just leave it in 2's complement form?

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# Binary number.

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