The saxena family plans to install a light to illuminate part of their rectangular yard. nikki and dylan each proposed a different spot to place the light. the proposed placements and the lit area that each produces are shown below. how do nikki's and dylan's proposals compare? check all that apply.

can you make your screen more see able?

then i might be able to .

you need to add a picture

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."

point m is on plane r