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7 March, 18:43

Mari has 3 friends who are available to go with her to the movies, but she only has 2 extra tickets. How many different choices does Mari have for which 2 friends to invite?

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  1. 7 March, 19:04
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    3 different choices

    Step-by-step explanation:

    This problem is a combination problem: She has 3 friends, and we want to know how many groups of 2 friends there are. We can solve this using the combination of 3 choose 2:

    C (3,2) = 3! (1! * 2!) = 3*2/2 = 3 possibilities

    If we call her three friends A, B and C, the groups that can be formed are:

    A and B

    A and C

    B and C
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