math optional for UPSC

1.(a) यदि A = [ 1 − 1 1 2 − 1 0 1 0 0 ] A = 1 − 1 1 2 − 1 0 1 0 0 A=[[1,-1,1],[2,-1,0],[1,0,0]]A=left[begin{array}{ccc}1 & -1 & 1 \ 2 & -1 & 0 \ 1 & 0 & 0end{array}right]A=[1−112−10100] है, तो A − 1 A − 1 […]