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WBJEE 2015 Math Solved Paper

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Question : 6 of 80
 
Marks: +1, -0
If the four points with position vectors −2
^
i
 +
^
j
 +
^
k
 ,
^
i
+
^
j
+
^
k
 ,
^
j
−
^
k
 and λ
^
j
+
^
k
 are coplanar, ten λ =
Validate
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