Number of Unique Paths
##### Submissions: 12041   Accuracy: 53.52%   Difficulty: Easy   Marks: 2

Given a M X N matrix with your initial position at top-left cell, find the number of possible unique paths to reach the bottom right cell of the matrix from the initial position.

Note: Possible moves can be either down or right at any point in time, i.e., we can move to matrix[i+1][j] or matrix[i][j+1] from matrix[i][j].

Input:
The first line contains an integer T, depicting total number of test cases. Then following T lines contains an two integers A and B depicting the size of the grid.

Output:
Print the number of unique paths to reach bottom-right cell from the top-left cell.

Constraints:
1 ≤ T ≤ 30
1 ≤ M ≤ 15
1 ≤ N ≤ 15

Example:
Input:
2
2 2
3 4

Output:
2
10

Example:
Testcase 1:

There are only two unique paths to reach end of the matrix of size two from starting cell of the matrix.

#### ** For More Input/Output Examples Use 'Expected Output' option **

Author: shef5

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