If I understand the question, and if I am not mistaken, three or any number number of planes can intersect in one line.
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Yes they can. In fact, infinitely many planes can intersect in one line, at least theoretically.
No, they intersect at a line.
Two planes do not intersect at all if the planes are parallel in three-dimensional space.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
No. The planes must either coincide (they are the same, and intersect everywhere), be parallel (never intersect), or intersect in exactly one line.