Try this one too

 

I am quite convinced about this combination expression that I have put. Because it was in 2010 that I made the Measuring Behavious equation. I did not know many things. I was not sure of comb(n,r). But absolutely sure of comb(2n,n). And now comb(n,1). comb(n,1) was a genuine thought inside me. I used to think why only one aspect? 

So, I can use comb(n,1).