** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER). Hold down both the CTRL key and the SHIFT
key then hit ENTER.
You haven't told us what you want to do if A2 is not NA? One solution based
on your question as written is:
=IF(ISNA(A2),AVERAGE(A1,A3),"")
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