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47. Solving x +2y + 2z = 0,3x - 4y + z = 0
x2 + 3y2 + z2 = 11 following roots are obtained
(a) 2, 1, -2 and -2,-1,2
(6) 2, 1, 2 and -2, -1, -2
(C) Only 2, 1, -2
(d) Only -2,-1,2
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