If | c|^2 = 60 and c ( i + 2 j + 5 k ) = 0, then a value of c (-7 i + 2 j + 3 k ) is:

JEE Main 2014 Mathematics question

If and , then a value of is:

Answer: (4)

The vanishing cross product means is parallel to , so with \vec$ c|^2 = 30λ^2 =

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Question ID VK-104521