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You can use either of the first two equations, depending on what values are given. If given deltaG directly, then the first equation is easier to use. If only given standard cell potential, then the second equation is easier to use. The third can be used when the reaction is not in equilibrium.
Either of the first two equations can be used. Just be sure to choose the one that is simplest used based off of the variables provided. For galvanic cells, the equation involving cell potential will likely be the best equation to use.
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