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Design a K-Map for F(x, y, z) = \(x\overline{z} + xyz + y\overline{z}\) of F(x, y, z) and find prime implicants.

  • A.\(xy,\ y\overline{z},\ x\overline{z}\)
  • B.\(x,\ y,\ z\)
  • C.\(\overline{x}y,\ yz,\ x\overline{z}\)
  • D.\(x\overline{y},\ yz,\ \overline{x}z\)

Answer: A

The prime implicants are \(xy,\ y\overline{z},\ x\overline{z}\).

Expand each term into minterms (x y z as a binary number): \(x\overline{z}\) gives 100 and 110, \(xyz\) gives 111, and \(y\overline{z}\) gives 010 and 110. So F = m(2, 4, 6, 7).

On the K-map, 6 and 7 pair as \(xy\), 2 and 6 pair as \(y\overline{z}\), and 4 and 6 pair as \(x\overline{z}\). None of these can be enlarged further, so all three are prime implicants (and all are essential).

Single literals x, y, z would cover cells where F is 0, and the terms \(\overline{x}y\), \(yz\), \(x\overline{y}\), \(\overline{x}z\) each include a 0 cell such as 011, 001 or 101.

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