If i consider first bit as sign bit.. we can store my number in rest 7 bits. so in that case 127 is the smallest number that can be stored. so why -127 isn't the answer?

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+13 votes

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

- $-256$
- $-128$
- $-127$
- $0$

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