If ((a^{\to}\timesb^{\to})\times(c^{\to}\timesd^{\to})) . (a^{\to}\timesd^{\to}) = 0 , then which of the following is always true ?

Correct Answer is : either →b or →c must lie in the plane of →a and →d

a^{\to},b^{\to},c^{\to},d^{\to} are necessarily coplanar

either a^{\to} or d^{\to} must lie in the plane of b^{\to} and c^{\to}

either b^{\to} or c^{\to} must lie in the plane of a^{\to} and d^{\to}

either a^{\to} or b^{\to} must lie in the plane of c^{\to} and d^{\to}

VITEEE 2017 Paper

Section: Mathematics

Question : 95 of 125

Marks: +1, -0

If ((

→

)×(

→

)) . (

→

) = 0 , then which of the following is always true ?

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