Insert an Array Formula via VBA
You're looking for the FormulaArray property that you can set for a cell like so:
Range("A1").FormulaArray = "=INDEX(subset!R1C1:R2472C10,MATCH(1,(RC1=subset!C1)(RC2=subset!C2)(RC5=subset!C5)*(RC6=subset!C6),0),10)"See the documentation here: http://msdn.microsoft.com/en-us/library/office/ff837104%28v=office.15%29.aspx