How do you clear RNP for an HP 12C
I take it you mean a 12C Platinum.
Press f ALG. ALG is the f-shifted function of the EEX key, just above the double-size ENTER key. This will switch the 12C Platinum from RPN mode to Algebraic mode, and ALG indicator will light up instead of the RPN indicator.
To switch back to RPN, press f RPN. RPN is the f-shifted function of the CHS key just above the EEX key.
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