Question

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]

• A. $\frac{1}{3}(1,4,-1)$
• B. (3, 4, -3)
• C. $\frac{1}{3}(3,4,-3)$
• D. None of these

Answer 1

The correct option is B

(3, 4, -3)

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