Simplify using a K-map: F(A, B, C, D) = Σ(3, 4, 5, 6, 7, 11, 15)

1. AAB + C′D
2. BA′B + CD
3. CAC + BD
4. DA′B + B′C

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Correct answer: B. A′B + CD

Explanation

Minterms 4, 5, 6, 7 form the quad A′B. Minterms 3, 7, 11, 15 form the quad CD. So F = A′B + CD.