The value for sessions is derived from processes (*1.1 + 5, or something like that?) and although Oracle documentation advises that this may need to be adjusted if you manually adjust the processes parameter, I don't believe I have ever supported a system where I have had to do this, RAC or not. Unless your system has a particular quirk that requires you to visit this parameter specifically, I would leave it set to the value derived from the processes setting.
I hope this helps,
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