Ok, i used this formula and it highlighted every row.
=MOD(ROUNDUP(SUM(1/COUNTIF
($A$2:$A$132,$A$2:$A$132)),0),2)=1
I then added another of
=MOD(ROUNDUP(SUM(1/COUNTIF($A$2:$A$132,$A$2:$A$132)),0),2)=0
and it changed every row to the colour i've set for this.
Neither seemed to be selecting...