Determine whether the series is absolutely convergent 1-(1*3/3! (1*3*5/5! -（3*5*7）

It's not clear what your series is, so I'm going to take a wild guess on what it is you mean:




For the sum to be absolute convergent, the sum of the absolute value of the summand must converge, so you are really examining the convergence of



This is easily checked with the ratio test:




Since converges by the ratio test, the series converges absolutely.

Where is the graph function?