Boolean Logic · 5 question types
Past paper frequency (2018 to 2024)
This topic accounts for approximately 6% of your exam marks.
Writing Boolean expressions from logic diagrams and simplifying using laws appear regularly.
A typical exam question gives you a Boolean expression and asks you to simplify it, stating the law used at each step. The marks usually go on showing the working rather than just the final answer.
General strategy. (1) Identify any constants (
0or1) inside the expression and clear them with the identity or annihilator laws. (2) Look for complement pairs (A · ¬AorA + ¬A) and replace them. (3) Apply absorption if a term is fully contained in another. (4) Use De Morgan's to push NOTs onto individual variables when that helps. (5) Repeat until no law applies.