This is a geometric sequence: sqrt(12), sqrt(3), sqrt(3/4), sqrt(3/16), sqrt(3/64), sqrt(3/256).....and so on. Keep multiplying the denominator by 4, so:256 X 4=3/1024, 3/4096.........etc.
I'm NOT sure as to you want: The sum of the 1st. 20 terms is:6.9281966............etc.
The 20th term is 3/68,719,476,736.
P.S. This is in Albanian language.
