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The straight lines x+y-4=0, 3x+y-4=0 and...

The straight lines `x+y-4=0, 3x+y-4=0` and `x+3y-4=0` form a triangle, which is

A

isosceles

B

right angled

C

equilateral

D

none of these

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The correct Answer is:
A
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