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Question

If a , b are the vectors of A , B respectively, find the position vector of a point C. AB produced such that AC = 3AB and that a point D in BA produced such that BD = 2BA

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Solution

Let position vector of C=c
Let position vector of D=d
AC=ca
AB=ba
BD=db
BA=ab
AC=3AB
ca=3(ba)
ca=3b3a
c=3b2a
BD=2BA
db=2(ba)
db=2b2a
d=3b2a

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