1.

Find the position vector of a point R which divides the line joining the points P and Qwhose vectors i+2j-k and -i+j+k in the ratio 2:1 externally.

Answer»

SOLUTION :p.v.of R =`VEC(OR)`
` =(2(-overset^^i+overset^^j+overset^^k)-1(overset^^i+2overset^^j-overset^^k))/(2-1)`
`-3overset^^i+3overset^^k`


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