The function ply) gives the number of polar bears in a national park after a number of years y. The meaning of each equation below can be written in words.
For each equation, drag the statement that has the same meaning as that equation into
the spot next to it

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."