18. lim an+1 (n + 1)! n n 1 = lim n" (n+ 1)n lim = lim lim

an +1 18. lim series n 1 nn 1 lim (n + I)n+l n! lim (n + I)n+l lim 1 1, so the is absolutely convergent by the Ratio Test. an +1 18. lim series n 1 nn 1 lim (n + I)n+l n! lim (n + I)n+l lim 1 1, so the is absolutely convergent by the Ratio Test.