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If A-=(p,q,r) and B-=(p^('),q^('),r^('))...

If `A-=(p,q,r)` and `B-=(p^('),q^('),r^('))` are two points on the line `lamdax=muy=vz` and `OA=a,OB=b` where `O` is origin then the value of `(pp^(')+qq^(')+rr^('))` is equal to

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