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To get the 2s complement, find the 1s complement (by inverting the bits) and add 1.

Assuming that number is [4-bit] binary it would be 1000.

If it is preceded by 0s, as in, for example, 0000 1000, then it would be 1111 1000.

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Q: The 2's compliment of the number 1000 is?
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