Boolean-Expressions

Question 1

If w, x, y, z are Boolean variables, then which one of the following is INCORRECT?

A
wx + w(x + y) + x(x + y) = x + wy
B
C
D
(w + y)(wxy + wyz) = wxy + wyz
       Digital-Logic-Design       Boolean-Expressions       GATE 2017 [Set-2]       Video-Explanation
Question 1 Explanation: 
Option-A:
wx + w(x + y) + x(x + y)
= (wx + wx) + wy + (x + xy)
= wx + wy + x(1 + y)
= wx + wy + x
= (w + 1)x + wy
= x + wy
Option-B:

Option-C:

Option-D:
(w + y)(wxy + wyz) = wxy + wyz + wxy + wyz = wxy + wyz
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