1001 is 2 's complement representation of \( \qquad \)
The MSB of 1001 is 1, so the number is negative.
To find its value, take the 2's complement: invert the bits to get 0110, then add 1 to get 0111 = 7.
So 1001 represents −7.
Check: \(-8 + 1 = -7\).
Answer: (A) −7
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