10.59 can you explain how to apply the ln function on the denominator big pi (xi!) I understand the product of ln means you actually add so it becomes a summation but then how do you simplify the ln

10.53. Given a random sample of size n from a Poisson population, use the method of moments to obtain an estimator for the parameter A. 10.59. Use the method of maximum likelihood to rework Exercise 10.53