Asked by homework 2 years ago

A __________ is an ordered arrangement of r objects chosen from n objects

A __________ is an arrangement of r objects chosen from n distinct objects, without repitition and without regard to order

probability

permutations

combinations

A **permutation** is an ordered arrangement of r objects chosen from n objects

A **combination** is an arrangement of r objects chosen from n distinct objects, without repetition and without regard to order

$ _{n}P_{r} = P(n,r) = \frac{n!}{(n-r)!} $

$ _{n}C_{r} = C(n,r) = \frac{n!}{(n-r)!r!} $

To summarize, in a permutation the order matters, in a combination the order doesn't matter.

Surround your text in `*italics*`

or `**bold**`

, to write a math equation use, for example, `$x^2+2x+1=0$`

or `$$\beta^2-1=0$$`

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Asked: 2 years ago