Paths through a grid

mediumRecursion20 XP

Start in the top-left cell of a grid with rows rows and cols columns. Moving only right or down, how many different paths reach the bottom-right cell?

Examples

Input: rows = 3, cols = 3
Output: 6
Input: rows = 1, cols = 5
Output: 1

Examples use JSON: true/false/null are True/False/None in Python.