1.

The three points with position vectors ¯¯¯a+¯¯b,¯¯¯a−¯¯b and ¯¯¯a+λ¯¯b are collinear for

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The three points with position vectors ¯¯¯a+¯¯b,¯¯¯a¯¯b and ¯¯¯a+λ¯¯b are collinear for




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