SOLUTION: A pollster randomly selected 2 of 12 available people. How many different groups of two are possible? Number of possible groups=

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Question 1155178: A pollster randomly selected 2 of 12 available people.

How many different groups of two are possible?

Number of possible groups=
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
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It is the number of all combinations of 12 people taken 2 at a time


    C%5B12%5D%5E2 = %2812%2A11%29%2F2 = 6*11 = 66.    ANSWER

Solved.

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On Combinations,  see introductory lessons
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
    - OVERVIEW of lessons on Permutations and Combinations
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Combinatorics: Combinations and permutations".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.