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Who could have made the right decision at the right time to avoid the tragedy of Tristan and Isolde?

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9. Which of the following is an orthogonal pair of vectors? (a) 2i - ji + k (b) i- j + 2k, -i-j-k (d) 5i + j + k, -i +2j + 3k (e) None of these - **-*-*-* (c) 3i - 2k, 2j - k

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