Find unit vectors that satisfy the stated conditions. NOTE: Enter the exact answers in terms of i, j and k. (a) Same direction as - 3i + 7j. u (b) Oppositely directed to 10i - 5j + 20k. V (c) Same direction as the vector from the point A(-2, 0, 2) to the point B(3, 1, 1). W=

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