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The smallest integer that can be represented by an $8-bit$ number in $2's$ complement form is

1. $-256$
2. $-128$
3.  $-127$
4. $0$
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Range of 2's compliment no = > (- 2n-1 )to + (2n-1 - 1 )

Here n = No of bits = 8.

So minimum no = -2 ^ 7 = (B) -128

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