Digital logic

• What Does a 3-Input XOR Gate Do?
  A 3-input XOR outputs 1 when an odd number of inputs are high. See its truth table, Boolean expression, and two-gate implementation.
• How to Get a Simplified Sum of Products from a Truth Table
  Write the canonical SOP from the rows where the output is 1, then simplify with Boolean algebra or a Karnaugh map. Fully worked 3-variable example.