24. Refer to Exercise 20. Instead of selecting n
20 helmets to examine, suppose I examine helmets in succession until I have found r
3 flawed ones. If the 20th helmet is the third flawed one (so that the number of helmets examined that were not flawed is x
17), what is the mle of p? Is this the same as the estimate in Exercise 20? Why or why not? Is it the same as the estimate computed from the unbiased estimator of Exercise 17?