Suppose a tanning experiment is designed to compare a tanning salon to tanning lotion. Four people are randomly separated into two groups. Two people use the salon and the other two people use tanning lotion. The tans of the four people are then ranked. Complete parts a through c below. a. Show the 6 possible ways the four ranks could be allocated, two to each treatment, with no ties. Use ranks ranging from 7 to 10. Fill in the missing ranks. Salon 9,10 - 8,9 7,10 7,9 Lotion ___ 7,9 7,10 ___ 0 8,10 9,10 (Use a comma to separate answers as needed. Use ascending order.)