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If the distance between the planes 4x -...

If the distance between the planes ` 4x -2y - 4z +1 =0 and 4x -2y -4z + d=0 is 7`, then d is

A

`41 or -42 `

B

`42 or -43 `

C

` -41 or 43`

D

` -42 or 44`

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The correct Answer is:
C
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