Express the vector in the form ai + bj + ck.
if P1 is the point (1, 4, 1) and P2 is the point (3, 1, -3)
A. v = -2i + 3j - 4k
B. v = -2i + 3j + 4k
C. v = -2i - 3j + 4k
D. v = 2i - 3j - 4k
Answer: D
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