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The three points whose position vectors ...

The three points whose position vectors are `vec a - vec 2b + 3 vec c, vec 2a + vec 3b - 4 vec c` and -`7 vec b + 10 vec c`

A

form a right angled triangle

B

form a equilateral triangle

C

are collinear

D

form an isosceles triangle

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The correct Answer is:
C
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