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Which Boolean identity is known as the absorption law ?

  • A.A + A = A
  • B.A + AB = A
  • C.A + A’ = 1
  • D.A(B + C) = AB + AC

Answer: B

Correct answer: A + AB = A

The absorption law states A + AB = A, because whenever AB is true A is already true, so the second term adds nothing. It is one of the most useful simplifications when reducing an expression by hand.

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