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If P ,Q and R are three collinear poi...

If `P ,Q` and `R` are three collinear points such that ` vec P Q= vec a` and ` vec Q R` = ` vec bdot` Find the vector ` vec P R` .

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`P vec{R}=P vec{Q}+overrightarrow{Q R}`
`P vec{R}=vec{a}+vec{b}`
therefore ,The value of `overrightarrow{P R}=vec{a}+vec{b}.`
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