If vectors v1 = 3i + 4j + k and v2 = i - j - k, determine the magnitude of v1 + v2.

If vectors v1 = 3i + 4j + k and v2 = i - j - k, determine the magnitude of v1 + v2.
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If vectors v1 = 3i + 4j + k and v2 = i - j - k, determine the magnitude of v1 + v2.
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