Answer
0
Work Step by Step
Showing that the Boolean sum y1 + y2 +· · ·+yn,
- where yi = xi or yi = xi , has the value 0 for exactly one combination
of the values of the variables,
- namely, when xi = 0 if yi = xi and xi = 1 if yi = xi .
-y1 + y2 + · · · + yn = 0
-if and only if yi = 0 for i = 1, 2, . . . , n.
-This holds if and only if xi = 0 when yi = xi and xi = 1 when $~y_{i}$ = $~x_{i}$ .
