Question: Let r1 and r2 be vectors from the origin to the points P1(x1, y1, z1) and P2(x2, y2, z2), respectively. What does the equation r

Let r1 and r2 be vectors from the origin to the points P1(x1, y1, z1) and P2(x2, y2, z2), respectively. What does the equation
r = (1 - t)r1 + tr2 (0 ≤ t ≤ 1)
represent geometrically? Explain your reasoning.

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