If the position vectors of A and B are ( 2 -1) i - j and i +( 2 +1) j respectively, then what is the magnitude of AB ?

NDA 2021 Mathematics question

If the position vectors of and are and respectively, then what is the magnitude of ?

Answer: (C)

$=-=[1-(2-1)] i+[(2+1)-(-1)] j=(2-2) i+(2+2)

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Question ID VK-033681