1.
Let A=(2102)A = \begin{pmatrix} 2 & -1 \\ 0 & 2 \end{pmatrix}. If B=I5C1(adjA)+5C2(adjA)25C3(adjA)3+5C4(adjA)45C5(adjA)5B = I - {}^5C_1(\text{adj}\, A) + {}^5C_2(\text{adj}\, A)^2 - {}^5C_3(\text{adj}\, A)^3 + {}^5C_4(\text{adj}\, A)^4 - {}^5C_5(\text{adj}\, A)^5, then the sum of all elements of the matrix BB is: