math

You have to answer
2
essay questions for an exam. There are
8
essays to choose from. How many different groups of
2
essays could you possibly choose?

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  1. Let's number each essay, 1 - 8

    1, 2; 1,3; 1,4; 1,5; 1,6; 1,7;, 1,8 >> 8
    2,3; 2,4; 2,5; 2,6, 2,7; 2,8 >> 6

    Keep going.

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  2. There are 8 ways to choose the 1st question.
    Now that that one's taken, there are 7 ways to choose the 2nd one.
    So, ...

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  3. 21

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