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Circle And Chords

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1. You are given a number N.
2. There are 2*N points on a circle. You have to draw N non-intersecting chords on a circle.
3. You have to find the number of ways in which these chords can be drawn.
Input Format 
A number N
Output Format 
Check the sample output and question video.
Question Video
Constraints 
1 <= N <= 1000
1 <= arr[i] <= 100
Sample Input 
3
Sample Output 
5


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