2×C(n,2)=90
Then, C(n, 2)=45.
The above formula represents the combination number of 2 in n.
Obviously, n= 10.
Therefore, a * * * has 10 teams.
The second question,
One person infects N people, so after two rounds, one person infects n×n people.
That is, n×n=64
So, n=8.
That is, one person infects eight people.
A. mathematical analysis, advanced mathematics, advanced algebra, linear algebra. What are the differences and connections between these courses?