MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A lock on a bank vault consists of three​ dials, each with
30
positions. In order for the vault to​ open, each of the three dials must be in the correct position.
 
a.  
How many different possible dial combinations are there for this​ lock?
b.  
What is the probability that if you randomly select a position on each​ dial, you will be able to open the bank​ vault?
c.  
Explain why​ "dial combinations" are not mathematical combinations expressed by the equation
nCx=n!x!(n−x)!.
 
 
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