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GO Classes DPP | GATE CS | Digital Logic | Full Adder Truth Table

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In a full adder, sum is $1$ when the number of $1$s in the input is odd.

So, $S=0$ when the number of $1$s is even.

Carry output is $1$ when at least two inputs are $1$.

Now we need both conditions together:

$S=0$ and $C_{out}=1$

This happens when exactly two inputs are $1$.

The combinations are:

$011,101,110$
 

Answer: B

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