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The Boolean expression (a + b̅ + c + d̅) + (b + c̅) simplifies to

1. 1
2. a̅.b̅
3. a.b
4. 0

Correct answer: 1

Solution

The expression simplifies to 1 because it covers all possible combinations of the variables a, b, c, and d, ensuring that at least one term will always evaluate to true regardless of the values of the individual variables.

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