Digital Electronics
The maximum positive and negative numbers which can be represented in two’s complement form using n bits are respectively,

 +2n-1,-2n-1
 +(2n-1-1),-2n-1
 +2n-1,-(2n-1+1)
 +(2n-1-1),-(2n-1-1)

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 at any input causes the output to be at logic 1.
0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0

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