Using recursion, write a program that asks a user to enter the starting coordinates (row, then column), the ending coordinates (row then column), and calculates the number of paths from the starting coordinate to the ending coordinate.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.