Counting Methods
ACT Math · Flashcards
ACT MATH · FLASHCARDS
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QUESTION
What is the number of ways to choose
r
r
r
items from
n
n
n
distinct items when order does not matter?
QUESTION
What is the number of distinct permutations of the letters in
LEVEL
\text{LEVEL}
LEVEL
?
QUESTION
How many ways can 5 different keys be arranged on a keyring?
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ANSWER
4. Circular arrangement with identical rotations.
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