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B
^j
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C
^k
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D
Null vector
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Solution
The correct option is C Null vector ^i,^j,^k are 3 mutually perpendicular vectors such that ^i×^j=k ^j×^k=i ^k×^i=j. Hence ^i×(^j×^k)+^j×(^k×^i)+^k×(^i×^j) =^i×(^i)+^j×(^j)+^k×(^k) =0