If A(1, 2, -1) and B(-1, 0, 1) are given, then the co-ordinates of P which divides AB externally in the ratio 1:2, are [MP PET 1989]

$\frac{1}{3} (1, 4, - 1)$

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(3, 4, -3)

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$\frac{1}{3} (3, 4, - 3)$

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None of these

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Solution

The correct option is B
(3, 4, -3)

$[\frac{2 + 1}{1}, \frac{4 - 0}{1}, \frac{- 2 - 1}{1}] = (3, 4, - 3) .$

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