# #math

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s2 and s3

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Good Evening, So far, I have completed P&ds, Algos, TOC, OS, DLD, APTITUDE, CD. I want to start my first revision along with the previous year papers. What is the best way to revision and solving previous year questions? because I want to concentrate on the remaining subjects? Thank you in Advance.
If $A$ is $2\times 2$ matrix ,eigen value is $1,-2$ and corresponding eigen vector $[1,2]^{T}$ and $[9,1]^{T}$.find sum of element of the matrix $A.$