Direction cosines and direction ratios - class-XII

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Question 1 of 53

The points with position vectors $60\hat{i}+3\hat{j}$, $40\hat{i}-8\hat{j}$, $a\hat{i}-52\hat{j}$ are collinear if

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$a=-40$

$a=40$

$a=20$

$None\ of\ these$

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