Mathematics

Mathematics

Problem

Which statement best describes the convergence of the series ∑n=0∞(−1)n (n+1)!(n+2)!\displaystyle \sum_{n=0}^{\infty} (-1)^{n}\,\frac{(n+1)!}{(n+2)!}? a) It converges conditionally; the alternating series converges, but the series of absolute values diverges. b) It converges absolutely; applying the ratio test gives a limit of 00, so the series converges. c) It diverges; simplifying the factorials gives the harmonic series, which is known to diverge. d) It converges to exactly 11 because the factorial terms create a telescoping pattern.

Browse the problem library