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