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The opposite vertices of a square are (1...

The opposite vertices of a square are `(1,2) and (3,8),` then the equation of a diagonal of the square passing through the point `(1,2),` is

A

`3x+y-1 =0`

B

`3y-x-1 =0`

C

`3x+ y+1=0`

D

None of these

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The correct Answer is:
A
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