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Q.) Vectors a = i + 2j + 3k, b = 2i - j + k and c = 3i + j + 4k are so placed that the end point of one vector is the starting point of the next vector. Then the vectors are

[A]not coplanar

[B]coplanar but cannot form a triangle

[C]coplanar and form a triangle

[D]coplanar and can form a right-angled triangle

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