Difference between revisions of "2020 AMC 12B Problems/Problem 15"
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| − | + | ==Problem== | |
| − | <math>(A) | + | 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 5<math> pairs so that the members of each pair know each other? |
| + | |||
| + | </math>(A) 11<math> </math>(B) 12<math> </math>(C) 13<math> </math>(D) 14<math> </math>(E) 15$ | ||
Revision as of 21:18, 7 February 2020
Problem
There are 
people standing equally spaced around a circle. Each person knows exactly 
of the other 
people: the 
people standing next to her or him,as well as the person directly across the circle. How many ways are there for the people to split up into 5
(A) 11$$ (Error compiling LaTeX. Unknown error_msg)(B) 12$$ (Error compiling LaTeX. Unknown error_msg)(C) 13$$ (Error compiling LaTeX. Unknown error_msg)(D) 14$$ (Error compiling LaTeX. Unknown error_msg)(E) 15$
