The perimeter of a triangle is 36 inches the first side of the triangle is 17.35 inches the second side of the triangle is 6.84 inches what is the length of the third side of the triangle?

can i know which language is this?

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."