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i. If ((5)/(3),(22)/(3),(-22)/(3)) is th...

i. If `((5)/(3),(22)/(3),(-22)/(3))` is the centroid of `DeltaPQR` with vertices `P(a,7,-10),Q(1,2b,-6),R(4,9,3c)`, find the values of a, b and c.
ii. Prove `DeltaPQR` is isosceles.

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