Beginner
Discrete Mathematics & Math
Q14 / 100
What is a permutation?
Correct! Well done.
Incorrect.
The correct answer is B) An ordered arrangement of items from a set — P(n,r) = n!/(n-r)!
B
Correct Answer
An ordered arrangement of items from a set — P(n,r) = n!/(n-r)!
Explanation
P(n,r) = n!/(n-r)! counts ordered arrangements of r items from n. Arranging 3 of 5 people in a line: P(5,3) = 60. Order matters: ABC ≠ CBA.
Progress
14/100