1. How many 3-letter security codes can be made from the 4 letters A, B, C, D? For exam- ple, BAB and ABB are two such codes, and DAC is another. Explain.

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Chapter9: Sequences, Probability And Counting Theory
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1. How many 3-letter security codes can be made from the 4 letters A, B, C, D? For exam-
ple, BAB and ABB are two such codes, and DAC is another. Explain.
Transcribed Image Text:1. How many 3-letter security codes can be made from the 4 letters A, B, C, D? For exam- ple, BAB and ABB are two such codes, and DAC is another. Explain.
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