title: Excel Find intersection of two arrays without VBA
body: <p>I have two columns filled with numbers and N/A. How can I find the intersection of two arrays without using VBA?
  Let's say in A2:A8 I have (1,3,4,7,10,"N/A",12) and in B2:B10 I have (2,3,5,7,15,20,40,"N/A",60). I need the intersection, excluding "N/A", which should be (3,7) for this example.</p>