Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2005/paper-1/7/b/i/solution

Substituting into the fitted factorial logarithm gives
This is an estimate from the requested two-point fit, not an exact factorial evaluation.

New to topics? Read the docs here!