1.

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

Answer»

`70//11`
`7//11`
`10//7`
`17//11`

ANSWER :A


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