Which of the following problems must be determined using a combination? Determine the probability of rolling doubles with a pair of dice. O Determine the number of ways a President and Vice-President can be chosen from a class of 20 students. Determine the number of ways Billy and Samantha can be chosen when a group of 5 is selected from a class of 20 students. Determine how many ways 10 people can sit on a bench.

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