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You are given the set of letters{ A, B, C, D, E} . What is the probability that in a random five-letter string (in which
You are given the set of letters{
A, B, C, D, E}
. What is the probability that in a random five-letter string (in which each letter appears exactly once, and with all such strings equally likely) the letters A and B are next to each other? The answer to a previous exercise may also be useful here. (In this and subsequent questions, your answer should be a number. Do not enter '!' or combinations in your answer.)
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