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The line x+y=k meets the pair of straigh...

The line x+y=k meets the pair of straight lines `x^(2)+y^(2)-2x-4y+2=0` in two points A and B. If O is the origin and `angleAOB=90^(@)` then the value of `kgt1` is

A

5

B

4

C

3

D

2

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