Consider the following relations for emf of a electrochemical cell
1
Emf of cell = (Oxidation potential of anode) - (Reduction potential of cathode)
2
Emf of cell = (Oxidation potential of anode) + (Oxidation potential of cathode)
3
Emf of cell = (Reduction potential of anode) + (Reduction potential of cathode)
4
Emf of cell = (Oxidation potential of anode) - (Oxidation potential of cathode)