8. Given that F = A'B'+ C'+ D'+ E', which of the following represent the correct expression for F'?

  1. F'= A+B+C+D+E
  2. F'= ABCDE
  3. F'= AB(C+D+E)
  4. F'= AB+C'+D'+E'
  5. F'= (A+B)CDE

4 is WRONG. This is wrong! Try using DeMorgan's theorem.

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