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Let the pairs a , b,and c ,d each determ...

Let the pairs `a , b,and c ,d` each determine a plane. Then the planes are parallel if a.`( vec axx vec c)xx( vec bxx vec d)= vec0` b. `( vec axx vec c).( vec bxx vec d)= vec0` c. `( vec axx vec b)xx( vec cxx vec d)= vec0` d. `( vec axx vec b).( vec cxx vec d)= vec0`

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