Question
A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if 9 of
A security system uses a four-letter password, but no letter can be used more than once. How many possible passwords are there if 9 of the letters of the alphabet can be used by the system? So I am confused do I take in to question that there are 26 letters in the alphabet or not? It does not give that in the actual questions
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An Introduction to Measure Theoretic Probability
Authors: George G. Roussas
2nd edition
128000422, 978-0128000427
