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" (1) If "0^(@)<A,B<90^(@)," such that "...

" (1) If "0^(@)

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If A=[(0,0,0,0),(0,0,0,0),(1,0,0,0),(0,1,0,0)] then (A) A^2=I (B) A^2=0 (C) A^3=0 (D) none of these

If A=[(0,0,0,0),(0,0,0,0),(1,0,0,0),(0,1,0,0)] then (A) A^2=I (B) A^2=0 (C) A^3=0 (D) none of these

If {:A=[(a,0,0),(0,b,0),(0,0,c)]:}," then "A^(-1) , is..... a) [(a,0,0),(0,(1)/(b),0),(0,0,c)] b) [((1)/(0),0,0),(0,(1)/(b),0),(0,0,c)] c) [(a,0,0),(0,(1)/(b),0),(0,0,(1)/(c))] d) [((1)/(a),0,0),(0,(1)/(b),0),(0,0,(1)/(c))]

Volume of tetrahedron with vertices at (0, 0, 0), (1, 0, 0), (0, 1, 0), (0, 0, 1) is

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If A=[(a, 0,0),(0,b,0),(0,0,c)] and a,b,c are non zero real numbers, then A^-1 is (A) 1/(abc) [(1,0,0),(0,1,0),(0,0,1)] (B) 1/(abc) [(a,0,0),(0,b,0),(0,c,0)] (C) 1/(abc) [(a^-1,0,0),(0,b^-1,0),(0,c^-1,1)] (D) [(a^-1,0,0),(0,b^-1,0),(0,0,c^-1)]