1. The problem statement, all variables and given/known data 1. lim as n approaches infinity of ((n+1)^5-(n-1)^5)/n^4 2. lim as n to infinity (n!)^2/(2n)! 2. Relevant equations 3. The attempt at a solution 1.I split it up, got (((n+1)/n)^4)*(n+1)-(((n-1)/n)^4)*(n-1). I try to simplify that down to (n+1)-(n-1) and got 2 as my answer, since the other portion of the limit evaluates to 1. Wolframalpha, however, gave me 10 as the answer. 2. I never seen a problem involving limits with just factorials, so I just guessed that n factorial squared grows faaster than (2n)! so the answer is infinity but wolframalpha says the answer is 0.