Difference between revisions of "2020 AMC 12B Problems/Problem 15"

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==Problem==
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#REDIRECT [[2020 AMC 10B Problems/Problem 17]]
 
 
There are <math>10</math> people standing equally spaced around a circle. Each person knows exactly <math>3</math> of the other <math>9</math> people: the <math>2</math> people standing next to her or him,as well as the person directly across the circle. How many ways are there for the <math>10</math> people to split up into <math>5</math> pairs so that the members of each pair know each other?
 
 
 
<math>\textbf{(A)}\ 11 \qquad\textbf{(B)}\ 12 \qquad\textbf{(C)}\  13 \qquad\textbf{(D)}\ 14 \qquad\textbf{(E)}\ 15</math>
 
 
 
==See Also==
 
 
 
{{AMC12 box|year=2020|ab=B|num-b=14|num-a=16}}
 
{{MAA Notice}}
 

Latest revision as of 20:15, 12 February 2020