Find the values of p so that the lines ...

Find the values of p so that the lines
`(1-x)/(3)=(7y-14)/(2p)=(z-3)/(2)` and `(7-7x)/(3p)=(y-5)/(1)=(6-z)/(5)` are at right angles.

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The correct Answer is:

`therefore P=(70)/(11)`

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