If the planes x+2y+kz=0 and 2x+y-2z=0, a...

If the planes `x+2y+kz=0` and `2x+y-2z=0`, are at right angles, then the value of k is

A

`-1//2`

B

`1//2`

C

`-2`

D

2

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The correct Answer is:

D

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