A password to a certain database consists of digits that cannot be repeated. If the password is known to consist of at least 8 digits and it takes 12 seconds to try one combination, what is the amount of time, in minutes, necessary to guarantee access to database?  Choose the correct choice from the following options:	A) 8!/5	B) 8!/2	C) 8!	D) 10!/2	E) 5/2.10!
Total # of passwords possible for 8 digits is P810=10!2   Total # of passwords possible for 9 digits is P910=10!   Total # of passwords possible for 10 digits is P1010=10!   Time needed to guarantee access to database is (10!2+10!+10!)∗15=10!2 minutes.   Answer: 10!/2.
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A password to a certain database consists of digits that cannot be repeated. If the password is known to consist of at least 8 digits and it takes 12 seconds to try one combination, what is the amount of time, in minutes, necessary to guarantee access to database?