What is a combination?
Combinations and Permutations

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•
Mathematics
•
12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A selection of items from a larger set where the order does not matter.
2.
FLASHCARD QUESTION
Front
What is a permutation?
Back
An arrangement of items from a larger set where the order does matter.
3.
FLASHCARD QUESTION
Front
How many different area codes can be created if the first digit can be 2-9, the second digit can be 0 or 1, and the third digit can be 0-9?
Back
160
4.
FLASHCARD QUESTION
Front
What is the formula for combinations?
Back
C(n, r) = n! / (r!(n - r)!) where n is the total number of items, and r is the number of items to choose.
5.
FLASHCARD QUESTION
Front
What is the formula for permutations?
Back
P(n, r) = n! / (n - r)! where n is the total number of items, and r is the number of items to arrange.
6.
FLASHCARD QUESTION
Front
If you are choosing 3 toppings from a list of 15, what method do you use?
Back
Combination.
7.
FLASHCARD QUESTION
Front
If you are arranging 7 players in a batting order from a team of 12, what method do you use?
Back
Permutation.
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