Question
Solve each counting problem.How many different three-letter computer passwords are available if any letters can be used but repetition of letters is not allowed?
Step 1
Step 1: We are asked to set up a three-letter password where each letter cannot be repeated. Show more…
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Solve by the method of your choice. How many different four-letter passwords can be formed from the letters A, B, C, D, E, F, and G if no repetition of letters is allowed?
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How many different four-letter passwords can be formed from the letters $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}, \mathrm{E}, \mathrm{F},$ and $\mathrm{G}$ if no repetition of letters is allowed?
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PASSWORD