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If the points P (a+b - c), Q(2a+ 3b) and...

If the points P (a+b - c), Q(2a+ 3b) and R (b + c) are collinear, where a, b, c are three coplanar vectors, then the value of t is

A

`-2`

B

`-1//2`

C

`1//2`

D

2

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The correct Answer is:
D
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