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The lines x+(k-1)y+1=0 and 2x+k^2y-1=0 a...

The lines x+(k-1)y+1=0 and `2x+k^2y-1=0` are at right angles if

A

k=1

B

kgt1

C

k=-1

D

none of these

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JBD PUBLICATION-STRAIGHT LINES-EXAMPLE
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