Mathematics, 22.10.2020 23:01, f13vsdbd

Alex wants to select two different numbers from the set {1, 2, 3, 4, 5}. In how many ways can he do this so that the two numbers are not consecutive?

two different numbers from the set {1, 2, 3, ..., n}. In how many ways can he do this so that the two numbers are not consecutive?

three different numbers from the set {1, 2, 3, 4, 5, 6}. In how many ways can he do this so that there are no pairs of consecutive numbers among the three?

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Alex wants to select two different numbers from the set {1, 2, 3, 4, 5}. In how many ways can he do...