PLEASE EXPLAIN
2(n+1)! 2^(2n)
_________ * ______ =
2^(2 (n +1)) 2n!
2 (n + 1)! 2^(2n)
_______ * _________ =
2n! 2^(2n +2)
n * 2 ^(2n - (2n + 2) =
n * 2 ^(-2) =
n / 2^2 =
n / 4 = (1/4) n
(1/4) * lim [ n ] > 1 {this series diverges }
n →inf