Given two positive numbers n and k, where n>=k. In how many ways can we write n as sum of k positive numbers. Same numbers but different orders are considered different.
Example
For n=5, k=2 the answer is 4.
5 = 1 + 4
5 = 2 + 3
5 = 3 + 2
5 = 4 + 1
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please correct the reference solution to com(x,k) instead of com(x)
Please correct test cases, the function should have 2 arguments.
Error message: Not enough input arguments.
The test suite has been corrected.