Unique Path

You are given two integers m and n representing the number of rows and columns of a grid. A robot starts at the top-left cell (0, 0) and wants to reach the bottom-right cell (m-1, n-1). The robot can only move: Right (R) Down (D) Your task is to calculate the total number of unique paths the robot can take to reach the destination. Return the total number of possible paths.

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