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The d.r's of the line of intersection of...

The d.r's of the line of intersection of the panes `x + y + z -1 =0 and 2x + 3y + 4z + 7=0` are

A

`1,2,-3`

B

`2,1,-3`

C

`4,2,-6`

D

`1,-2,1`

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The correct Answer is:
D
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