ISRO Computer Science (CSE) 2014 - Question 56

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Which of the following is not valid Boolean algebra rule?

  • A. $X \cdot X = X$
  • B. $(X + Y) \cdot X = X$
  • C. $\overline{X} + XY = Y$
  • D. $(X + Y) \cdot (X + Z) = X + YZ$

Answer: C. $\overline{X} + XY = Y$

Explanation: $\overline{X} + XY = \overline{X} + Y$. It is not equal to $Y$.

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