If John, Trey, and Miles want to know how’ |
many two-letter secret codes there are that dont
Explain your answers clearly and thoroughly, drawing ‘on this section’s definition of multiptication.
Tolnaio
2021-10-07
Answered
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Expert Answer
Viktor Wiley
Answered 2021-10-08
Author has 84 answers
Trey and Miles are correct — we can either use the reasoning “we do not
want for the two letters to be the same, so for the first letter we have 26
choices and for the second we have 25”, so we get 26-25, or we can find
the number of all two-letter codes, which we have 26-26, and subtract the
number of two-letter codes with a repeated letter, which we have 26.
Adding 26 and 25 makes no sense, since for each choice of the first letter we have 2% additional codes.
Adding 26 and 25 makes no sense, since for each choice of the first letter we have 2% additional codes.
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