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.
None. In conventional geometry, any intersection of two planes defines a line, which is an infinite number of points. Many planes may intersect along a single line, or any pair of planes may intersect creating a unique line, but however they intersect, the number of shared points is infinite. If the the planes do not intersect (if they are parallel), then they share zero points.
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.
Two distinct planes will intersect in one straight line.
No, two planes do not intersect in exactly one plane unless the planes are exactly overlapping, making one plane. In Euclidean Geometry two planes intersect in exactly one line.
Yes they can. In fact, infinitely many planes can intersect in one line, at least theoretically.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
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.
No, the two planes intersect at a line, which is an infinite number of points.
Two planes that intersect do that at a line. neither a segment that has two endpoints or a ray that has one endpoint.