Multiple choice

if x, y, z are Boolean variables, then

  1. x.x = 1

  2. x (y + z) = (x + y) (x + z)

  3. x + xz = x

  4. x + y = y + x
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option D represents the Commutative Law of Boolean algebra, which states that x + y = y + x. Option A is incorrect (x.x = x), Option B is incorrect (distributive law is x + yz = (x + y)(x + z)), and Option C is incorrect (x + xz = x is actually the Absorption Law, but the question asks for a general identity).

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