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The points with position vectors 60i + 3j, 40i - 8j and ai - 52j are collinear if (A) a = −40 (B) a = 40

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The points with position vectors 60i + 3j, 40i - 8j and ai - 52j are collinear if

(A) a = −40 

(B) a = 40 

(C) a = 20 

(D) None of these

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Answer is (A) a = −40

The points are collinear, therefore

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