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If a, b and c are non-coplanar vectors and if d is such that `d = (1)/(x) (a + b + c) and a = (1)/(y) (b + c + d)` where x and y are non-zero real numbers, then `(1)/(xy) (a + b + c + d) =`

A

3c

B

`-a`

C

0

D

2a

Text Solution

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The correct Answer is:
C
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