Two lines x = ay + b, z = cy + d and x = aʹy + bʹ, z = cʹy + dʹ will be per….

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Two lines x = ay + b, z = cy + d and x = aʹy + bʹ, z = cʹy + dʹ will be perpendicular if and only if

Options :-

1. aaʹ + bbʹ + ccʹ = 0
2. (a + aʹ) (b + bʹ) (c + cʹ) = 0
3. aaʹ + ccʹ + 1 = 0
4. aaʹ + bbʹ + ccʹ + 1 = 0

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