Some friends spent the afternoon collecting aluminum cans for recycling. The friends spent a total of 6 hours collecting cans. Hector
collected 86 cans, Jonas collected 89 cans, and Sherrrie collected 113
cans. The friends collected the same amount of cans each hour. How
many cans did the friends
collect each hour?

b

step-by-step explanation:

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."