Counting Flashcards

1
Q

Ordered choice with repetitions

A

n^k

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2
Q

Ordered choice without repetitions

A

n! / (n-k)!

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3
Q

Unordered choice without repetitions

A

n! / k!(n-k)! = (n choose k)

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4
Q

Unordered choice with repetitions

A

(k+n-1) choose (n-1)

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5
Q

what does n stand for

A

n options / number of choices

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6
Q

what does k stand for

A

how many we want / number of spots to fill / how many we are working with

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7
Q

How to calculate n choose k

A

n! / k!(n-k)!

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