Question 608494: A company with 3000 employees requires that computer passwords consist of 4 digits followed by 3 letters. Each password cannot repeat a letter or number, and no password can be repeated. Passwords must be changed, by the employees, at the beginning of each month. To the nearest year, how many years of passwords exist?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website!
Hi
passwords consist of 4 digits followed by 3 letters. Each password cannot repeat a letter or number,
10 digits and 26 letters generates:
10·9·8· 7· 26· 25· 24
no password can be repeated.
To the nearest year, how many years of passwords exist?
3000 employees,changing passwords at the beginning of each month
(10·9·8·7·26·25·24)/(12·3000)
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