Let a , b and c be unit vectors lying on the same plane. What is (3 a +2 b ) (5 a -4 c ) ( b +2 c ) equal to?

NDA 2022 Mathematics question

Let , and be unit vectors lying on the same plane. What is equal to?

Answer: (D)

Since lie in one plane, the three vectors , and (being combinations of them) also

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Question ID VK-029479