l. If w is an imaginary cub root of unity 7 and A = (6 ), B=( 9), then (A + B)103 is equal to (a) wl, (b) -12 . (c) -w-1, (d) -wl2 000

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We kmow that: ( 1+w+w^{2}=0 ) ( left{1+w=-w^{2}right. ) vo ( =left(begin{array}{cc}-w 2 & 0 0 & -w^{2}end{array}right) ) ( left.frac{-w^{2} I}{a} frac{left(1 cdot w^{20}right)}{a}=left(w^{3}right)^{67}right] )

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