Stephen wrote...
I am using this formula to calculate a geomean, but would like to omit
line
13 and 17 and 19 in the o9:o24 range.

{=EXP(AVERAGE(LN(1+O9:O24)))-1}

=EXP(AVERAGE(LN(1+O9:012),LN(1+O14:O16),LN(1+O18), LN(1+O20:O24)))-1
or

=EXP(SUM(LN(1+O9:O24)*{1;1;1;1;0;1;1;1;0;1;0;1;1;1 ;1;1})/13)-1