Hello. I need help in calculating the limit.

Lim((sqrt((n+1)*(n+2)*(n+3)*...*(2n-1)*2*n) of n)/n), n=infinity.

Surely, it exists.

I can't understand how I shall express the root of the product in the nominator or should I. I can understand that there must be k*n in the nominator, but I don't know how to find this k. simple product of n is not suitable.

Great thanks for everybody who will try to help me.