If the points represented by complex num...

If the points represented by complex numbers `z_(1)=a+ib, z_(2)=c+id " and " z_(1)-z_(2) ` are collinear, where `i=sqrt(-1)`, then

`ab' + a'b = 0`

`ab' - a'b = 0`

`ab + a'b' = 0 `

`ab - a'b' = 0`

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