Thread: Lim of An=n^2*exp(-sqrt(n)) View Single Post
 Recognitions: Science Advisor Simple method: Let m=√n, so the problem is limit m -> ∞ m4/em. em = 1 + m + m2/2! + m3/3! + m4/4! + m5/5! + .... It is obvious from the 5th term on the denominator of the fraction swamps the numerator.