Consider a system of equations where the ith equation is ai i=bi i+1+ci i-1+di. While solving this system using Thomas algorithm, we get i=Pi i+1+Qi. What are P1 and Q1?

• A. (P_1= frac{d_1}{a_1-c_1};Q_1= frac{b_1}{a_1-c_1} )
• B. (P_1= frac{b_1}{a_1-c_1};Q_1= frac{d_1}{a_1-c_1} )
• C. (P_1= frac{d_1}{a_1};Q_1= frac{b_1}{a_1} )
• D. (P_1= frac{b_1}{a_1};Q_1= frac{d_1}{a_1} )