At a company, ten employees and ten interns line up to visit the CEO in ten randomly selected pairs. If each pair of employees receives a copper ring, each pair of interns receives a brass ring, and each employee-intern pair receives a silver ring, what is the probability that the number of copper rings received equals the number of brass rings received?
A.
1
B.
\(\frac{1}{2}\)
C.
\(\frac{1}{3}\)
D.
none of above
Exam No：2020-2021 Math League First Round Grades 8-9 Year：2021 Question No：24
Answer:
A
Knowledge points:
G8-9 - Probability - Compound Probability
Solution:
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