SOLUTION: A "combination" lock has a three-number "combination" where the numbers are chosen from the set {1, 2, 3, ... , 19, 20}.What is the probability that the "combination" has no repea

Algebra ->  Probability-and-statistics -> SOLUTION: A "combination" lock has a three-number "combination" where the numbers are chosen from the set {1, 2, 3, ... , 19, 20}.What is the probability that the "combination" has no repea      Log On


   

Question 347918: A "combination" lock has a three-number "combination" where the numbers are
chosen from the set {1, 2, 3, ... , 19, 20}.What is the probability that the "combination" has no repeated numbers?
A. .00015 B. .75 C. .15 D. .855
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: To find the probability, compute P%2820%2C3%29%2F%2820%5E3%29


Note: P(20,3) is also written as 20%5EP%2A3