6. a password contains at least 8 distinct digits. it takes 12 seconds to try one combination, what is the minimum amount of time required to guarantee access to the database?

6048 hours is required to guarantee access to the database

Explanation:

If a password contains 8 distinct digits, then there are P(10,8) permutations possible

P(10,8)=10! / (10-8)! = 10!/2! = 1814400

Since it takes 12 seconds to try one combination,

1814400×12 = 21772800 seconds is required to guarantee access to the database. This is

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