If the centroid of the triangle formed by points P(a, b), Q(b, c) and R(c, a) is at the origin, w...

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If the centroid of the triangle formed by points P(a, b), Q(b, c) and R(c, a) is at the origin, what is the value of a+b+c ?, what is the value of a^2/b c+b^2/c a+c^2/a b ?

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