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Question
Choose the correct alternative:
The distance between the planes x + 2y + 3z + 7 = 0 and 2x + 4y + 6z + 7 = 0 is
Options
`sqrt(7)/(2sqrt(2))`
`7/2`
`sqrt(7)/2`
`7/(2sqrt(2))`
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Solution
`sqrt(7)/(2sqrt(2))`
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