hannnnah_j’s Biological Test
Time Limit: 2000/1000 MS (Java/Others)
Memory Limit: 131072/131072 K (Java/Others)
hannnnah_j is a teacher in WL High school who teaches biology.
One day, she wants to test m students, thus she arranges n different seats around a round table.
In order to prevent cheating, she thinks that there should be at least k empty seats between every two students.
hannnnah_j is poor at math, and she wants to know the sum of the solutions.So she turns to you for help.Can you help her? The answer maybe large, and you need to mod 1e9+7.
First line is an integer T(T≤1000).
The next T lines were given n, m, k, respectively.
0 < m < n < 1e6, 0 < k < 1000
For each test case the output is only one integer number ans in a line.
2016 ACM/ICPC Asia Regional Shenyang Online