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A security system uses a 2-letter password, but no letter can be used more than once. How many possible passwords are there if 8 of
A security system uses a 2-letter password, but no letter can be used more than once. How many possible passwords are there if 8 of the letters of the alphabet can be used by the system?
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An Introduction to Analysis
Authors: William R. Wade
4th edition
132296381, 978-0132296380
