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Question

The unit vector perpendicular to both of the vectors 2 ^i^j+^k and 3^i+4^j^k is

A
±(3^i+5^j+11^k)155
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B
±(3^i+5^i+11^k)
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C
±(3^i5^j+11^k)155
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D
±(3^i+5^j+11^k)156
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