1.40. In how many ways can five persons line up to get on a bus? In how many ways can they line up if two of the persons
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1.40. In how many ways can five persons line up to get on a bus? In how many ways can they line up if two of the persons
1.40. In how many ways can five persons line up to get on a bus? In how many ways can they line up if two of the persons refuse to follow each other?
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