[" If the points "A(60hat i+3hat j),B(40...

[" If the points "A(60hat i+3hat j),B(40hat i-8hat j)," and "C(ai-52hat j)" are collinear,then "a" is equal to "],[[" (A) "40," (B) "-40," (C) "20," (D) "-20]]

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