Permutations & Combinations

Flashcard
•
Mathematics
•
9th - 12th Grade
•
Hard
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12 questions
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1.
FLASHCARD QUESTION
Front
What is a permutation?
Back
A permutation is an arrangement of objects in a specific order. The order of arrangement matters.
2.
FLASHCARD QUESTION
Front
What is a combination?
Back
A combination is a selection of objects where the order does not matter.
3.
FLASHCARD QUESTION
Front
How many ways can a club select a president, vice president, and a secretary from a group of 5 people?
Back
60
4.
FLASHCARD QUESTION
Front
What does the P stand for in nPr?
Back
Permutations
5.
FLASHCARD QUESTION
Front
Calculate 20P2.
Back
380
6.
FLASHCARD QUESTION
Front
What is the formula for permutations of n objects taken r at a time?
Back
nPr = n! / (n - r)! where n is the total number of objects and r is the number of objects to arrange.
7.
FLASHCARD QUESTION
Front
What is the formula for combinations of n objects taken r at a time?
Back
nCr = n! / [r!(n - r)!] where n is the total number of objects and r is the number of objects to choose.
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