A manufacturer produced 30 identical cellular devices that were shipped to selected clients for beta testing. The manufacturer suspected that the devices might have a defect, and decided to recall 10 of the 30 shipped devices incrementally. The first device is recalled, tested, and test outcomes are reported to help with testing future devices. The second device is then recalled, tested differently than first device to reflect gained knowledge from testing the first device, and so on and so forth for third, fourth, . . . , to tenth device. What is the number of cases of selecting 10 out of 30 devices in this case?