1.

If the lines barr={a+1(1-a)}hati+(a-ta)hatj+{c+t(1-c)}hatk and barr_1={c+t(1-c)}hati+(c-tc)hatj+{b+t(1-b)}hatk lies on the plane x/a+x/b+z/c=1, then

Answer»

`2c=a+B`
`C^2=ab`
c is the H.M. of a and b
c=0

Answer :B


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