Given ri = 3i - ej +In2 k, r2 = 5i + 7 e'j - 4 k and r3= 7i-7j+ k. Find the unit vector of (a) r1-2r2+3r3 (b) r1-4 r3 (c) r2- r3 (d) r1-r2+r3

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