GRE Math Eq > Combinations & Permutations > Flashcards

Combinations & Permutations Flashcards

(5 cards)

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1
Q

Combinations

A

Order does NOT matter

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2
Q

The Basic Combination Formula

A
  • n = the number of objects in the set
  • k = number of objects selected
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3
Q

The Basic Permutation Formula

A
  • n = the number of objects in the set
  • k = number of objects selected
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4
Q

The Permutation Formula for Indistinguishable Items

A
  • N = total number of objects to be arranged
  • r = the frequency of each indistinguishable object
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5
Q

Circular Arrangements

A

Number of ways to arrange a set of items in a circle
* (k - 1)!
* k = the number of objects to be arranged in a circle

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GRE Math Eq
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