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If the equation k^(2)x^(2)+10xy+3y^(2)-1...

If the equation `k^(2)x^(2)+10xy+3y^(2)-15x-21y+18=0` represents a pair of mutually perpendicular lines then

A

`k=5`

B

`k=+-sqrt(2)`

C

`k=3`

D

`k` is not real

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The correct Answer is:
D
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