Combos, Permutations, & Probability Flashcards

1
Q

Combo Formula

nCk

=

A
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2
Q

Permuation Formula

nPk

=

A
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3
Q

When there are indistinguishable object in a permuation problem…

(i.e. the different arrangement of ABBCDEEF)

what is the formula?

A

“N” = total number of objects to be arranged

each “r!” = the frequency of each indistinguishable object

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4
Q

The Kumbaya circle…

how many ways can a circle of people/objects be arranged?

A

(K-1)!

Where “K” = total number of kumbayayers in the circle

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5
Q

Complementary Events

A

P(A) + P(A’) = 1

Possibility of event A occuring + the possibility of A’s complimentary event (A’) = 1

or P(A’) = 1 - P(A)

DISTILLED TO…

P(Anot) = 1 - P(A)

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6
Q

Probability Questions that Involve Combinations

A

of Combos w/ given restrictions

———————————————————

of Combos possible

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