本题目来源于试卷: IB MAI HL Statistics & Probability Topic 4.3 Probability，类别为 IB数学
[问答题]
A city has two major secx1(v)g fm6tslgw a;x/x ioy 6)ur) gaets3 xm+n.ity guard companies, company $\mathrm{A}$ and company $\mathrm{B}$ . Each year, 15 % of customers using company $\mathrm{A}$ move to company $\mathrm{B}$ and 5 % of the customers using company B move to company A. All additional losses and gains of customers by the companies can be ignored.
1. Write down a transition matrix $\boldsymbol{T}$ representing the movements between the two companies in a particular year.
2. 1. Find the eigenvalues and corresponding eigenvectors of \boldsymbol{T} .
2. Hence write down matrices $\boldsymbol{P}$ and $\boldsymbol{D}$ such that $\boldsymbol{T}=\boldsymbol{P} \boldsymbol{D} \boldsymbol{P}^{-1}$ .
Initially company A and company B both have 3600 customers.
3. Find an expression for the number of customers company A has after n years, where n $\in \mathbb{Z}$ .
4. Hence write down the number of customers that company A can expect to have in the long term.
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