Cinema: Ewan and Aiden notice that they have both bought tickets to the same movie, and both

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Cinema: Ewan and Aiden notice that they have both bought tickets to the same movie, and both of them in row 13, which has 25 seats.

(a) How many different ways can Ewan and Aiden be placed in row 13?

(b) How many of these ways put them next to one another?

(c) (Chapter 5)

If the choice of tickets is random, what is the probability that they end up next to one another?

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