If the lines x = ay + b, z = cy + d andx = a'z + b', y = c'z + d' are – McqOptions

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1.	If the lines x = ay + b, z = cy + d andx = a'z + b', y = c'z + d' are perpendicular, then:
A.	ab'+ bc'+1 = 0
B.	cc' + a + a' = 0
C.	bb' + cc' + 1 = 0
D.	aa'+ c + c' = 0
Answer» E.

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