Note Figure is not drawn to scale.
If the sphere shown above has a radius of 3 units, then what is the volume of the sphere?
A.
72 or cubic units
B.
27 7 cubic units
C.
36 y cubic units
D.
18
cubic units

80

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."