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For a = i + j and b = j + k, the vector a × b is
Ai + j + k
B−i + j + k
Ci + j − k
Di − j + k
Answer & Solution
Correct answer: D. i − j + k
Expanding the determinant gives (1·1 − 0·1)i − (1·1 − 0·0)j + (1·1 − 0·1)k = i − j + k.
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