Permutations and Combinations

Flashcard
•
Mathematics
•
9th - 12th Grade
•
Hard
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15 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 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 do you calculate permutations of n objects taken r at a time?
Back
The formula is P(n, r) = n! / (n - r)!.
4.
FLASHCARD QUESTION
Front
How do you calculate combinations of n objects taken r at a time?
Back
The formula is C(n, r) = n! / [r!(n - r)!].
5.
FLASHCARD QUESTION
Front
What is the factorial of a number?
Back
The factorial of a number n (denoted as n!) is the product of all positive integers up to n.
6.
FLASHCARD QUESTION
Front
How many ways can you arrange 3 books on a shelf?
Back
6 ways (3! = 3 x 2 x 1 = 6).
7.
FLASHCARD QUESTION
Front
If you have 5 different shirts, how many ways can you choose 2 shirts?
Back
10 ways (C(5, 2) = 5! / [2!(5 - 2)!] = 10).
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