1.

If lines x+2y-1=0, ax+y+3=0, and bx-y+2=0 are concurrent, and S is the curve denoting the locus of (a,b), then the least distance of S from the origin is

Answer»

`5//sqrt57`
`5//sqrt51`
`5//sqrt58`
`5//sqrt59`

ANSWER :C


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