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

5 is CORRECT. 

F' = (A'B'  + C'+ D'+ E')'
   = (A'B')'* C * D * E    by Demorgan's law
   = (A + B')CDE           by Demorgan's law again

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