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Given the radius vectors: r1 = 3i - 2j + k r2 = 3i + 4j +9k r3 = -i +2j +2k Find the magnitude

Given the radius vectors:

r1 = 3i - 2j + k r2 = 3i + 4j +9k r3 = -i +2j +2k

Find the magnitude of r3, (r1 + r2 + r3), and (r1 - r2 + 4r3)

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