The answer is given below.
Step-by-step explanation: The description is as follows:
(a) 2 lines in the plane : Any two lines in a plane can either be parallel or intersect at only one point.
(b) 3 lines in the plane : Any three lines in a plane may intersect at a point, if so, they are called concurrent lines, or they may never intersect.
(c) 2 lines in space : There are exactly three possibilities.
* The two lines are distinct and they have no points in common.
* The two lines are distinct and they have exactly one point in common.
* The two lines are really the same line and they have all of their points in common.
(d) ) 3 planes in space : Here also, we have three possibilities:
* The three planes are distinct and they have no points in common.
* The three planes share exactly one point.
* The three planes share infinitely many points, i.e., they could all share a line or they could all be the same plane.
the answer is 99.