Teaching DSSSB PGT Mock Test 2025 Mathematics Three Dimensional Geometry Angle between two lines

Under which one of the following conditions are the lines x = ay + b; z = cy + d and x = ey + f; z = gy + h perpendicular?

1
ae + cg – 1 = 0
2
ae + bf – 1 = 0
3
ae + cg + 1 = 0
4
ag + ce + 1 = 0
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