A tennis ball can (pictured below) in the shape of a cylinder holds three tennis balls snugly (touching the sides, top, and bottom of the can). If the diameter of each tennis ball is 2.7 inches, what is the volume of the can that is not occupied by the tennis balls?

elli's hot cocao is more chocolaty

the square root of 16 is 4.

4*4 = 16

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."