There are 20 planes in space S. Any two of them will intersect each other. No three planes will meet at one line and any four of them will not meet at a same point. Into how many non-overlapped sub0spaces is S divided by these planes?
There are 20 planes in space S. Any two of them will intersect each other. No three planes will meet at one line and any four of them will not meet at a same point. Into how many non-overlapped sub0spaces is S divided by these planes?