The lines x−1a=y−23=z−34 x−23=y−34=z−45 are coplanar. Then a =
A
1
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B
2
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C
−1
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D
−2
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Solution
The correct option is C2 x−1a=y−23=z−34andx−23=y−34=z−45So,∣∣
∣∣2−13−24−3a34345∣∣
∣∣=0∣∣
∣∣111a34345∣∣
∣∣=01(15−16)−(5a−12)+(4a−9)=0−1+12−5a+4a−9=0a=2optionBiscorrectanswer.