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Question

Let G be the centroid of △ABC. If −−→AB=→a and −−→AC=→b, then −−→AG, in terms of →a and →b is

A
23(a+b)
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B
16(a+b)
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C
13(a+b)
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D
12(a+b)
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Solution

The correct option is D 13(a+b)
Let A be the origin.
then AB=a,AC=b implies that the position vectors of B and C are b and c respectively.
Let AD be the median and G be the centroid. Then,
P.V. of D=a+b2,
P.V. of G=a+b3
AG=a+b3

470995_37465_ans_60c392b4f86d4fe6965470dcc0797c47.png

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