1.

The vectors \({\rm{\vec \alpha }},{\rm{\;\vec b}},{\rm{\;\vec c}}\) and \({\rm{\vec d}}\) are such that \({\rm{\vec a}} \times {\rm{\vec b}} = {\rm{\vec c}} \times {\rm{\vec d}}\) and \({\rm{\vec a}} \times {\rm{\vec c}} = {\rm{\vec b}} \times {\rm{\vec d}}\). Which of the following is/are correct?1. \(\left( {{\rm{\vec a}} - {\rm{\vec d}}} \right) \times \left( {{\rm{\vec b}} - {\rm{\vec c}}} \right) = \vec 0\)2. \(\left( {{\rm{\vec a}} \times {\rm{\vec b}}} \right) \times \left( {{\rm{\vec c}} \times {\rm{\vec d}}} \right) = \vec 0\)Select the correct answer using the code given below:

A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
Answer» D. Neither 1 nor 2


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