If a = (2, 1, -1), b = (1, -1, 0), c = (5, -1, 1), then what is the unit vector parallel to a + b - c in the opposite direction? - NDA Mathematics 2012 (I)

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If a = (2, 1, -1), b = (1, -1, 0), c = (5, -1, 1), then what is the unit vector parallel to a + b – c in the opposite direction?