নিচের কোনটি সঠিক নয়?

  • \((\overline {\mathrm {A+B}}) = \mathrm {\bar A .\bar B }\)
  • \((\overline {\mathrm {A+B}}) = \mathrm {\bar A +\bar B }\)
  • \((\overline {\mathrm {A.B.C}}) = \mathrm {\bar A +\bar B+ \bar C }\)
  • \((\overline {\mathrm {A+B+C}}) = \mathrm {\bar A .\bar B. \bar C }\)