If the vectors a i + j + k , i +b j + k and i + j +c k (a, b, c 1) are coplanar, then the value of 1 1-a + 1 1-b + 1 1-c is equal to

NDA 2017 Mathematics question

If the vectors , and are coplanar, then the value of is equal to

Answer: (B)

Coplanarity: . Apply , : $ = 0 ⇒

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Question ID VK-028742