The sum of products expansion for the function \(F(x, y, z) = (x + y)\bar z\)…

2013

The sum of products expansion for the function

\(F(x, y, z) = (x + y)\bar z\) is given as

  1. A.

    \(\bar x \bar yz + xy\bar z + \bar xy\bar z\)

  2. B.

    \(xyz + xy\bar z + x \bar y \bar z\)

  3. C.

    \(x\bar y \bar z + \bar x \bar y \bar z + xy \bar z\)

  4. D.

    \(xy \bar z + x \bar y \bar z + \bar xy \bar z\)

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Correct answer: D

Goal: write F(x,y,z) = (x + y) z̄ as a sum of products (minterm) expansion.

  1. Distribute the common factor z̄: F = x z̄ + y z̄

  2. Expand each term to include all variables (so each product is a minterm): x z̄ = x(y + ȳ) z̄ = x y z̄ + x ȳ z̄

  3. Similarly, expand y z̄: y z̄ = y(x + x̄) z̄ = x y z̄ + x̄ y z̄

  4. Combine the expanded terms and remove duplicates: x y z̄ + x ȳ z̄ + x̄ y z̄

  5. Final sum-of-products (minterm) form: F(x,y,z) = x y z̄ + x ȳ z̄ + x̄ y z̄

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